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Two identical balls moving in opposite directions with speeds 20m/s and 25m/s undergo head on perfectly inelastic collision. The speed of combined mass after collision is 1. 20m/s 2. 22.5m/s 3. 25m/s 4. 2.5m/s
Asked by KRISHPATEL.soc | 22 Apr, 2022, 04:19: PM
Let u1 = 25 m/s and u2 = -20 m/s are velocities of identical balls before collision

Total initial momentum before collision  = m u1 + m u2 = ( m × 25 ) - ( m × 20 ) =  5m

Collision is perfectly inelastic , i.e. masses are combined together

Total  momentum after collision = ( 2m v )

where v is final velocity of combined mass

By conservation of momentum ( 2 m v ) =  5m   or v = 2.5 m/s
Answered by Thiyagarajan K | 22 Apr, 2022, 10:48: PM

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