A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down

A

Rubber and lead balls undergo equal changes in momentum

B

Change in momentum suffered by lead ball is less that of rubber ball

C

Momentum of rubber ball is less than that of lead ball

D

None of these

Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

A

Is directly proportional to their velocity of approach

B

Is inversely proportional to their velocity of approach

C

Bears a constant ratio to their velocity of approach

D

Is equal to the sum of their velocities of approach

A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

A

Both the balls undergo an equal change in momentum

B

The change in momentum suffered by rubber ball is more than the lead ball

C

The change in momentum suffered by rubber ball is less than the lead ball

D

None of the above

The phenomenon of collision of two elastic bodies takes place because bodies

A

Immediately after collision come momentarily to rest

B

Tend to compress each other till they are compressed maximum possible

C

Attempt to regain its original shape due to their elasticities

D

All the above

The surface of a certain planet reflects 80 percent of the light that strikes it. The clouds around the planet then absorb 40 percent of the reflected light. What percent of the light that strikes the planet is reflected from the surface and passes through the clouds without being absorbed?

A

32%

B

40%

C

48%

D

60%

During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

A

Equal to

B

Equal and opposite to

C

Less than

D

Greater than

stand next to the lamppost and face west ,walk 20 yards and then turn 90 degrees clockwise. Walk another 10 yards and then turn 45 degrees anticlockwise. Walk another 15 yards, reverse you direction and walk 5 yards back. Turn 135 degrees clockwise and walk another 10 yards . In which direction are you now facing?

A

West

B

East

C

South

D

North

The total time of collision and restitution of two bodies, is called

A

Time of collision

B

Period of collision

C

Period of impact

D

All the above

When a wave strikes a vertical breakwater in deep water, it is reflected back and on meeting another advancing wave of similar amplitude merges and rises vertically in a wall of water. This phenomenon is called

A

Surf

B

Clapotis

C

Fetch

D

Swell

A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity

A

One-half

B

One-third

C

Two-third

D

Three-fourth

A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

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