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 Form 3 Physics Newton's laws of motion questions and answers

A trolley is moving at constant speed in friction compensated track. Some plasticine is dropped on the trolley and sticks on it. State
with a reason what is observed about the motion of the trolley.

 (2m 14s)
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Answer Text:
- Since the momentum of the body remains constant ( conserved) the trolley slows down (its velocity reduces) since its mass increases.