a ball of mass m moves normal to a wall wid velocity u and rebounds wid velocity v the change in momentum of the ball during rebounding is?

a/ m(u+v ) towards the ball

b/ m(u-v ) towards the ball

c/ m(u+v) away frm the ball

d/ m(u-v away frm the ball

Let the direction away from the wall be taken as positive.

So, initial velocity of the ball is, u_{i} = -u [negative sign comes because it is directed towards the wall]

Final velocity of the ball is, u_{f} = v [away from the wall]

So, change in momentum is,

Δp = m(u_{f} – u_{i}) = m(v – (-u) = m(v+u)

Thus, the change in momentum is directed away from the wall.

Correct option is C.

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