Question

120. When a ball bounces off the ground, which ofthe following changes suddenly ?(Assume no loss of energy to the floor)(a)Its speed(b)Its momentum(c)Its kinetic energyIts potential energy(d)​

Answer 1

answer : option (b) its momentum, when a ball bounces off the ground momentum change suddenly.

as we know, momentum is vector quantity ( either linear momentum or angular momentum). it changes when direction of body changes.

let body falls from a certain height after striking the surface of ground, it starts to move in just opposite direction (i.e., bounce )

at that instant, velocity of body becomes negative of its initial velocity.

so, momentum of body will be change (i.e., negative with respect to initial value )

if we talk about other terms speed, kinetic energy, potential energy , all are scaler quantities. these are same at that instant. because these all depend only on magnitude.

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Answer 2

$\huge\bold\purple{Answer:-}$

energy(d)