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46. In a two-body collision, if the momentum of the
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# Question :   46. In a two-body collision, if the momentum of the : 2102125

46. In a two-body collision, if the momentum of the system is conserved, then which of the following best describes the kinetic energy after the collision?

A. must be less

B. must also be conserved

C. may also be conserved

D. is doubled in value

47. In a two-body collision, if the kinetic energy of the system is conserved, then which of the following best describes the momentum after the collision?

A. must be less

B. must also be conserved

C. may also be conserved

D. is doubled in value

48. A railroad freight car, mass 15 000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50 000-kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15 000-kg car is preserved in the two-coupled cars after collision?

A. 14%

B. 23%

C. 86%

D. 100%

49. A miniature, spring-loaded, radio-controlled gun is mounted on an air puck. The gun's bullet has a mass of 5.00 g, and the gun and puck have a combined mass of 120 g. With the system initially at rest, the radio-controlled trigger releases the bullet, causing the puck and empty gun to move with a speed of 0.500 m/s. Of the total kinetic energy of the gun-puck-bullet system, what percentage is in the bullet?

A. 4.0%

B. 50%

C. 96%

D. 100%

50. A 20-kg object sitting at rest is struck elastically in a head-on collision with a 10-kg object initially moving at +3.0 m/s. Find the final velocity of the 20-kg object after the collision.

A. -1.0 m/s

B. -2.0 m/s

C. +1.5 m/s

D. +2.0 m/s

## Solution 5 (1 Ratings )

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Physics 1 Year Ago 88 Views