1) 4 m/s A cart starting from rest rolls down a hill and at the bottom has a speed of 4 m/s. If the cart were given an initial push, so its 2) 5 m/s 3) 6 m/s initial speed at the top of the hill was 3 m/s, what would be its speed at the bottom? 4) 7 m/s 5) 25 m/s

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.