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1. |
A boy (30 kg) sitting on his horse whips it. The horse speeds up at an average acceleration of 2.0 m/s 2.If the boy does not slide back, what is the force of friction exerted by the horse on the boy ?$ |
A. | 20 N |
B. | 30 N |
C. | 40 N |
D. | 60 N |
Answer» E. | |