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A stone was thrown vertically upwards from the ground with a velocity of 50 m/sec. After 5 seconds another stone was thrown vertically upwards from the same place. If both the stones strike the ground at the same time, then the velocity with which the second stone was thrown should be (Assume g = 10 m/sec2)
Choose the option that correctly sequences the following sentences. 1. The baby tortoise once again limps his way up the tree and prepares to attempt another flight. 2. A baby tortoise climbs to the top branch of a tree and walks to the end of the branch. 3. As he tries to ‘fly’, he spreads his legs, waves them as hard as he can, but hits the ground very hard. 4. He spreads all his four flippers like a bird and jumps off the branch. 5. One of the two birds, who were watching his futile attempts to fly, turns to the other and says: “It's about time we told our baby tortoise that we adopted him.” 
Historically, the production of wood charcoal in locations where there is an abundance of wood dates back to a very ancient period, and generally consists of piling billets of wood on their ends so as to form a conical pile, openings being left at the bottom to admit air, with a central shaft to serve as a flue. The whole pile is covered with turf or moistened clay. The firing is begun at the bottom of the flue, and gradually spreads outwards and upwards. The success of the operation depends upon the rate of the combustion. Under average conditions, 100 parts of wood yield about 60 parts by volume, or 25 parts by weight, of charcoal; small-scale production on the spot often yields only about 50%, while large-scale became efficient to about 90% even by the seventeenth century. The modern process of carbonizing wood, either in small pieces or as sawdust in cast iron retorts, is extensively practiced where wood is scarce, and also for the recovery of valuable byproducts (wood spirit, pyroligneous acid, wood tar), which the process permits. The information given, if accurate, most strongly supports which of the following?
Which of the following example is correct about the diffusion? Example 1: The smell of food being cooked reaches us even from a considerable distance.  Example 2: The fragrance of the burning incense sticks spreads all around due to the diffusion of its smoke into the air. Example 3: The smell of perfume spreads due to the diffusion of perfume vapors into the air.
The following question is based on the given data for an examination. A. Candidates appeared 10500 B. Passed in all the five subjects 5685 C. Passed in three subjects only 1498 D. Passed in two subjects only 1250 E. Passed in one subject only 835 F. Failed in English only 78 G. Failed in Maths only 275 H. Failed in Physics only 149 I. Failed in Chemistry only 147 J. Failed in Biology only 221 How many candidates passed in at least four subjects ?
A ball is thrown vertically upwards and rises to a height of 15 m. Calculate the initial velocity at which the object was thrown upwards and the time taken by the ball to reach the highest point?
An object is thrown vertically upwards and rises to a height of 10 m. The velocity with which the object was thrown upwards will be
A player throws a ball upwards with an initial speed of 29.4m/s. What is the direction of acceleration during the upwards motion of the ball?
A ball of mass 1kg is thrown vertically upwards from a building with a speed of 10m/s, and another ball of mass 3kg is dropped from the same point towards the ground with the same speed. At what time will the centre of mass have the maximum height w.r.t the ground? Assume balls are left at t=0.
The formula to determine the height of the rocket above the ground at any time during the rocket's flight is given by: h = 119t - 7t2 where t = the time, in seconds, that has elapsed since the rocket was launched, and h = the height, in meters, of the rocket above the ground at time t. The value of h was 0 when the rocket hit the ground. How many seconds after the rocket was launched did it hit the ground?