A car of mass w travels in a straight line at constant speed along a level road

Question

A car of mass w travels in a straight line at constant speed along a level road with a coefficient of friction between the tires and the road of ft and a drag force F_n. The magnitude of the net force on the car is Following Danny is gliding at reveille Plaza on his skateboard at 3.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 7.0 m/s relative to the ground. How fast is Danny going as his feet hit the ground? Danny's mass is 55 kg and the skateboard's mass is 4.0 kg. 7.3 m/s. 3.2 m/s. 2.7 m/s. 3.7 m/s. 1.7 m/s.

Explanation / Answer

9. As the car is moving with a constant speed, the net force on the car is zero.

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