Question

A particle is projected at 60° to the horizontal with a kinetic energy K. The kinetic energy at the highest point is
(A) K
(B)
zero
(C)
R
(D)
N.​

Answer 1

Answer :- (B) Zero

Explanation :-

• Kinetic energy of a body is given by $\dfrac{1}{2}mv^2$

• At maximum height ,velocity of a particle becomes zero.Therefore,kinetic energy become zero.

• Do you know, why velocity becomes zero at maximum height ? This is because if velocity will not be zero,it can cover some more distance.Therefore,maximum height implies zero velocity.

• Potential energy of a body is maximum at maximum height and kinetic energy is lowest.

• Kinetic energy can't be negative but potential energy can.

• Potential energy depends on frame of reference but kinetic energy doesn't.

Answer 2

A participle is projected at 60° to the horizontal with a kinetic energy k.the kinetic energy at the H highest point is

(A) zero.