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8.1 Linear Momentum, Force, and Impulse

16 .
(credit: modification of work from Pinterest)

A 145-g baseball is incoming at a velocity of 35 m/s. The batter hits the ball as shown in the image. The outgoing baseball has a velocity of 40 m/s at the angle shown.

What is the magnitude of the x-component of the impulse?

  1. 0.26 kg⋅m/s.
  2. 4.09 kg⋅m/s.
  3. 4.35 kg⋅m/s.
  4. 8.44 kg⋅m/s.

For how long should a force of 130 N be applied to an object of mass 50 kg to change its speed from 20 m/s to 60 m/s?

  1. 0.031 s
  2. 0.065 s
  3. 15.4 s
  4. 40 s

8.3 Elastic and Inelastic Collisions


In an elastic collision, an object with momentum 25 kg⋅m/s (moving to the left) collides with another that has a momentum 35 kg⋅m/s, moving toward it to the right. The first object’s momentum changes to 15 kg⋅m/s, and it is now moving to the right. What is the magnitude of the momentum of the second object after the collision?

  1. 5 kg⋅m/s
  2. 10 kg⋅m/s
  3. 25 kg⋅m/s
  4. 75 kg⋅m/s
19 .
Find the recoil velocity of a 65 kg ice hockey goalie who catches a 0.15 kg hockey puck slapped at him at a velocity of 50 m/s . Assume that the goalie is at rest before catching the puck, and friction between the ice and the puck-goalie system is negligible.
  1. 0.12 m/s
  2. 0 m/s
  3. 0.12 m/s
  4. 7.5 m/s
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