Question

a ball is dropped from the top of a tower .the ratio of work done by force of gravity in 1st 2nd and 3rd second of the motion of ball is 1) 1:2:3 2) 1;4:16 3)1:3:5 4)1:9:25​

Answer 1

Answer:

1) A ball is released from the top of a tower. The ratio of work done by force of gravity in first, second and third second of motion of the ball is {answer should come 1:3:5}

2) The kinetic energy of a body of mass 2 kg and momentum of 2 Ns is:

{answer should come 1 joule}

3)A block of mass m is suspended by a light thread from an elevator. The elevator is accelerating upward with uniform acceleration a. The work done by tension on the block during t second is (u = 0) :      {diagram is given}      

{answer should come  \frac{m}{2}(g+a) a t^{2} }