More Work done problems - G-PISD



Work-Energy Theorem practice

1. A student wearing frictionless inline skates is pushed by a friend with a constant force of 45N. How far must the student be pushed, starting from rest, so that the final kinetic energy is equal to 352J?

2. A 2.0 X 103 kg car accelerates from rest under a constant force of 190N. Determine how far the car must travel to have the final speed be 2.00m/s.

3. A 75kg bobsled is pushed on a frictionless surface for a distance of 4.5m after starting from rest. The final speed of the bobsled is 6.0m/s. Find the force exerted on the bobsled?

4. A weight lifter raises a 180kg barbell from the ground to a height of 1.95m. What is the increase in potential energy?

5. An 8.0 kg block is moving at 3.2 m/s. A net force of 10N is constantly applied on the block in the direction of its movement until it has moved 16 m. What is the approximate final velocity of the block?

6. A man is driving a car with mass 1.00x103 kg, at a speed of 35 m/s on a highway. Suddenly, he puts on the brakes to avoid an accident. After the brakes are applied, a constant kinetic friction force of magnitude 7.00x103 N acts on the car. What is the minimum distance from the car ahead at which the brakes should be applied to avoid an accident?

7. A 32kg rock free falls from rest to a final speed of 19.62 m/s. Using the work energy formula, calculate the distance it fell. Confirm your answer using a kinematic equation (Fantastic Four). Show your work for credit.

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