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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?
There are two person A and B.A alone can complete the whole work in x days and B alone can complete the whole work in y days. Working together they can complete the whole work in 12 day. Which of the following statements is/are true regarding x and y? A) 20 days and 30 days B) 25 days and 300/13 days C) 32 days and 96/5 days D) 40 days and 10 days 
A rocket engine moving at 500 m/s produces a total thrust of 9563 N, consuming propellants at the rate of 4.55 kg/s. The energy content of the propellants is 5.35 MJ/kg. Find the effective exhaust velocity.
In the following question, five statements are given followed by four conclusions I, II, III and IV. You have to consider the given statements to be true even, if they seem to be at variance with commonly known facts. Read all the conclusions and decide which of the following logically follows from the given statements disregarding the commonly known facts. Statements: Some Blue are Color. All Color are Sky. No Rocket is Sky. All Rocket are Space. No Space is Color. Conclusions: I. Some Sky being Space is a possibility. II. Some Blue are Sky. III. Some Color being Rocket is a possibility. IV. Some Blue being Rocket, Space, Sky and Color is a possibility.
For a rocket having 95% combustion efficiency, total chemical power of 17MW, a mass flow rate of propellants of 15 kg/s, and effective jet exhaust velocity of 1443 m/s, find the internal efficiency of rocket propulsion.
Puneet completes a work in 12 days and Rachna completes a work in 6 days. But Puneet worked only for 4 days and Rachna worked only for 2 days. The remaining work was done by Sahil and Sachin who alone can complete the work in 10 days and 6 days respectively. Ratio of the number of days for which Sahil and Sachin worked is 1 : 1. Find the total number of days for which Rachna, Sahil, and Sachin worked.
'A' can do a work in 20 days and 'B' can do the same work in 15 days. 'B' works for 6 days and leaves work. In how many days can 'A' alone complete the remaining work? A. 12 days B. 4 days C. 6 days D. 5 days
A and B can do a piece of work in 30 days and 45 days respectively. They work together for 10 days and after that A goes on leave for 10 days and B works on every alternate day for the next 10 days and then goes on leave for the next 10 days after which A starts the work on every alternate day for the next 10 days. After that A and B together complete the remaining work. Find in how many days the work was completed.
Working together, P, Q and R reap a field in 6 days. If P can do it alone in 10 days and Q in 24 days, in how many days will R alone be able to reap the field? A. 32 days B. 40 days C. 45 days D. 60 days
In the following question, two statements are numbered as A and B. On solving these statements, we get quantities A and B respectively. Solve both quantities and choose the correct option. Quantity A: A can do a piece of work in 10 days and B can do the same work in 15 days. They start working together and after 4 days, A left the work. Find in how many days the total work will be completed. Quantity B: P can do a piece of work in 15 days and Q can do the same work in 25 days. They start working together and after 5 days, Q left the work. Find in how many days the remaining work will gets completed.