First slide

Special cases

Question

A steel ball of mass 1 kg, moving with a velocity of 2 m/s collides head-on and elastically with an identical steel ball. What is impulse acting on the second ball during the course of collision?

Easy

A

4 Kg-m/s
B

2.25 Kg-m/s
C

2.5 Kg-m/s
D

2 Kg-m/s

Solution

As a result of head-on elastic collision between the identical spheres, the first spheres will stop and the second one will start moving with velocity of 2 m/s.
$∴ Impulse = 1 \times 2 K g - m / s = 2 K g - m / s$

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