Topic: Newton's laws, force and inertia, momentum, impulse· Laws of Motion

A rigid ball of mass m strikes a rigid wall at 60° and gets reflected without loss of speed as shown in the figure below. The value of impulse imparted by the wall on the ball will be

A rigid ball of mass $m$ strikes a rigid wall at 60° and gets reflected without loss of speed as shown in the figure below. The value of impulse imparted by the wall on the ball will be

ball striking wall with 60 degree angles of incidence and reflection

1. $2mV$

2. $\frac{mV}{2}$

3. $\frac{mV}{3}$

4. $mV$

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 2 Practice test neet Save WhatsApp Report

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Answer: 4. $mV$

The wall is smooth, so only the component of velocity perpendicular to the wall changes; the parallel component stays the same.

In the figure each velocity makes $60^\circ$ with the normal (the dashed line). The normal component reverses from $+V\cos60^\circ$ to $-V\cos60^\circ$.

$$J=\Delta p=2mV\cos60^\circ=mV$$

Option (4).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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A rigid ball of mass m strikes a rigid wall at 60° and gets reflected without loss of speed as shown in the figure below. The value of impulse imparted by the wall on the ball will be

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