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A runner runs around a track consisting of two parallel lines 96m long connected at the ends by two semicircles with a radius of of 49m. She completes one lap in 100 seconds. What is her average velocity?
1. 2,5m/s
2. 5,0m/s
3. 10m/s
4. 1,3m/s
A car is driving at a constant speed when the driver applies the brakes, giving the car a deceleration of 3.50m/s^2. The car comes to a stop at a distance of 34.0m. What was the car's speed when it travelled 17.0m from the point where the brakes were applied?
1. 10.9m/s
2. 14,5m/s
3. 10,7m/s
4. 21,0m/s
5. 15.3m/s
A 12000kg car is pulling a 500kg trailer along level ground. Friction is negligible. The car accelerates with an acceleration of 1.3m/s^2. What is the force exerted by the car on the trailer?(The answer I got was 650N so please double check)
1. 550N
2. 600N
3. 650N
4. 700N
5. 750N
Don't give me the answers but please tell me what I have to do to reach the solutions.
