A 13 kg ball rolling at 4 m\'s collides with a much larger 12 kg ball that is si

Question

A 13 kg ball rolling at 4 m's collides with a much larger 12 kg ball that is sitting at rest. After the collision the 1.3 kg ball bounces backwards and rolls away at 1.4 after the collision 6) m/s. How fast does the 12 kg ball roll ANS: 0.57 m/s 7 ) A 60 kg astronaut floati ing at rest in space outside a space capsule throws his 0.5 kg hammer such that it moves with a speed of 10 m/s relative to the capsule. What is the final speed of the astronaut? ANS: 0.08m/s In a pairs figure-skating competition a 65 kg man and his 45 kg female partner stand at rest facing each other on skates on the ice. If they push apart and the woman has a velocity of 1.5 m/s eastward, what is the velocity of her partner? ANS: 1.04 m/s 8) 9)A 1,200 kg car moving to the right with a speed of 25 m/s collides with a 1,500 kg truck and locks bumpers with the truck. Calculate the velocity of the combination after the collision if the truck is (a) initially at rest, (b) initially moving to the right with a speed of 20 m/s, and (c) initially moving to the left with a speed of 20 m/s. ANS: (a) 11.1m/s; (b) 22.2 m/s;(c) 10)A 0.01 kg bullet moving horizontally at 400 m/s penetrates a 3 kg wood block resting on a horizontal surface. If the bullet slows down to 300 m/s after emerging from the block, what is the speed of the block immediately after the bullet emerges? ANS: 0.33 m/s

Explanation / Answer

Q.8:

60 ( v) - 0.5(10) =0

v= 0.08 m/s

Q: 9

65 (v) = 45 (1.5)

v= 1.04 m/s

Q: 10

a) 1200 (25) = ( 1200+ 1500)v

v = 11.1 m/s

1200 (25 )+ 1500(20) = ( 2700) v

v= 22.2 m/s

1200 (25) - 1500 (20 ) = 2700 v

v =0 m/s

Q: 10

0.01 (400) + 3( 0)= 0.01(300) + 3 (v)

v= 0.33 m/s

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