Question

a body of mass 100g moving with a velocity of 10.0m/s collides with a wall. if after collision, it moves with a velocity of 2.0m/s in the opposite direction. calculate the change in momentum.
step by step process please​

Answer 1

Answer :-

• Change in momentum = 1.2 kg.m/s

Explanation :-

➤. Given that :

• Mass of a body = 100 g
• Moving with a velocity = 10.0 m/s
• After the collision,
• Velocity = 2.0 m/s

➤ Formula used:-

• Momentum = Mass × Velocity
• Change in Momentum = Mass × Change in Velocity

• Let us assume that the body moves with the velocity of 10.0 m/s in negative direction.
• And after collision it's moving with the velocity of 2.0 m/s in positive direction.

Therefore:-

• Initial velocity = - 10 m/s
• Final velocity = + 2 m/s

➤ Formula to find change in velocity:

Change in velocity = Final velocity - Initial velocity

★ Finding the change in velocity:

• ➼ Change in velocity = [2 - (-10)] m/s
• ➼ Change in velocity = [2 + 10] m/s
• ➼ Change in velocity = 12 m/s

→ Converting the mass 100 g into kg:

• 1000 g = 1 kg
• 1 g = 0.001 kg
• 100 g = 0.1 kg

★ Finding the change in momentum:

• ➼ Change in momentum = 0.1 kg × 12 m/s
• ➼ Change in momentum = 1.2 kg.m/s

Answer 2

Answer:

1.2 kg m/s is the correct answer