Robert asks…Explain physics questions ?can any one explain these questions to me:
1-. A car is moving at a constant velocity of 20 km/h (5.56 m/s). How much net force is required to raise its velocity to 50 km/h (13.89 m/s) in 30 seconds? Suppose the car has a mass of 150 kg.
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2-If the net force of 7 N was continuously applied on 400 g object at rest, how long will it take to raise its velocity to 80 m/s?
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3-A book has a mass of 400 g. When you slided the book
