Question

The change of momentum in each ball of mass $60gm$, moving in opposite directions with speeds $4m/s$ collide and rebound with the same speed, is The change of momentum in each ball of mass $60gm$, moving in opposite directions with speeds $4m/s$ collide and rebound with the same speed, is

The change of momentum in each ball of mass $60gm$, moving in opposite directions with speeds $4m/s$ collide and rebound with the same speed, is

• A. $0.98kg ⥂ - ⥂ m/s$
• B. $0.73kg ⥂ - ⥂ m/s$
• C. $0.48kg ⥂ - ⥂ m/s$
• D. $0.22kg ⥂ - ⥂ m/s$

Answer 1

Answer: (C)

$0.48kg ⥂ - ⥂ m/s$

Answer 2

Momentum before collision = mv, Momentum after

collision = – mv

∴ Change in momentum

$= 2mv = 2 \times 60 \times 10^{- 3} \times 4 = 480 \times 10^{- 3}kg ⥂ - ⥂ m ⥂ / ⥂ s = 0.48kg - ⥂ m ⥂ / ⥂ s$