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in Physics by (71.7k points)

A strange cat with a mass mc is sitting at rest on the left sled of a pair of identical sleds. The sleds have mass ms and sit on frictionless ice. Suddenly, the cat leaps to the right sled, traveling with a horizontal speed vcg measured with respect to the ground. The instant the cat reaches the right sled, it turns around and leaps back to the left sled. The horizontal component of the cat’s speed is again vcg measured with respect to the ground. 

What is impulse imparted to right sled by cat?

(A) 2mcvcg 

(B) mcvcg 

(C) 2(mc + ms)vcg 

(D) zero

1 Answer

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by (79.8k points)
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Best answer

Correct option(B) mcvcg

Explanation:

Let mc be the mass of the cat, and ms be the mass of the sled. Since the ice is assumed to be frictionless, there is no external force acting on the cat-sled system, and so momentum is conserved at each 'jump'. 

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