Question

a body is moving with velocity of 20m/s has momentum 10kgm/s. find its mass​

Answer 1

• A ball of mass 10kg moving with velocity 20m/s collided elastically with the wall and rebound with the same speed .

• So, initial momentum of the ball = mv

= 10kg × 20 m/s = 200 kgm/s

• Final momentum of the ball = m(-v)

• [ here negative sign shows that velocity of ball is just opposite direction of its initial motion.]

• So, final momentum of the ball = -10 × 20 = -200 kgm/s

• Hence, change in momentum = final momentum - initial momentum
• = -200 - 200 = - 400 kgm/s

• Hence, magnitude of change in momentum of the ball is 400 kgm/s

Answer 2

Answer:

A ball of mass 10kg moving with velocity 20m/s collided elastically with the wall and rebound with the same speed .

So, initial momentum of the ball = mv

= 10kg × 20 m/s = 200 kgm/s

Final momentum of the ball = m(-v)

[ here negative sign shows that velocity of ball is just opposite direction of its initial motion.]

So, final momentum of the ball = -10 × 20 = -200 kgm/s

Hence, change in momentum = final momentum - initial momentum

= -200 - 200 = - 400 kgm/s

Hence, magnitude of change in momentum of the ball is 400 kgm/s

Explanation: