H2P-360
Relative speed in elastic collisions
H2 Physics · JC 2 · Medium · Relative speed in elastic collisions
Two small spheres P and Q of masses 0.30 kg and 0.20 kg move towards each other on a smooth line with speeds 2.0 m s⁻¹ and 3.0 m s⁻¹ respectively. They collide head-on elastically. What is the speed of approach of P and Q before the collision and the speed of separation after the collision?
- 5.0 m s⁻¹ before, 5.0 m s⁻¹ after
- 1.0 m s⁻¹ before, 1.0 m s⁻¹ after
- 5.0 m s⁻¹ before, 2.0 m s⁻¹ after
- 2.0 m s⁻¹ before, 5.0 m s⁻¹ after
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