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a shopper in a supermarket pushes a loaded cart with a horizontal force of 400N. the...

a shopper in a supermarket pushes a loaded cart with a horizontal force of 400N. the cart has a mass of 20kg.

a) how far will it move in 3 seconds, starting from rest? (ignore friction)

b) how far will it move in 3 seconds, if the shopper places his 100N baby in the cart before he begins to push it with the same 400N force?

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