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Ball A is dropped from rest from a window . At same instant ball B is thrown downwards and ball C is thrown upwards from the same window .which statement concerning the ball is necessarily true if air resistanse is neglected ? and why? [A] All 3 balls strike the ground at same time. [B] All 3 balls strike the ground at same velocity; [C] All 3 balls have same velocity at any instant. [D] all 3 bqlls have same accln at any instant.

Ball A is dropped from rest from a window . At same instant ball B is thrown downwards and ball C is thrown upwards from the same window .which statement concerning the ball is necessarily true if air resistanse is neglected ? and why?

[A]  All 3 balls strike the ground at same time.
[B]  All 3 balls strike the ground at same velocity;
[C]  All 3 balls have same velocity at any instant.
[D]  all 3 bqlls have same accln at any instant.

Grade:11

1 Answers

Blazing Ruler
37 Points
9 years ago

Ans is D.

See for ball 1 initial energy is mgh and similarly for the other two it is mgh+mv^2)/2. So on reaching the ground the three balss will have different velocities and will also take different time. Option 3 is pretty obvious to reject. For D every ball is having the same acceleration as g.

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