A mechanic pushes a 5 kg load on a cart arose a garage floor made of cement. The mechanic then pushes the same load across a grassy surface with the same force. He finds that the cart moves faster on the cement than on grass. What could be causing the change in the speed of the cart ?
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A mechanic pushes a 5 kg load on a cart arose a garage floor made of cement. The mechanic then pushe...
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