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# Help work out these questions pleasee!! Just as many as you can atleast.

1. A forklift raises crates of mass 600kg and a height of 3m. How much work is done?

2. What is the mass of a lift if 400 000J is required to raise the lift a height of 20m?

3. How much work must be done on a motor cycle of mass 250kg to accelerate it uniformly from rest at 3m/s for 4s?

4. What is the gain in kinectic energy of an object of mass 40kg if it falls from rest at 4m/s

5. What loss of kinectic energy occurs as the speed of a bicycle is reduced from 12m/s to 4m/s? The mass of bicycle and cyclist is 100kg.

6. What is the gain in potential energy of a pendulum bob of weight 15N which is raised vertically 0.1m above its lowest position?

7. A brick of mass 2kg is dropped from the top of a tower. How hgh is the tower if the velocity of the brick upon stricking the ground is 30m/s.

8. How high does a ball of mass 0.5kg travel if it is given an initial upward kinectic energy of 46J?

9. A pendulum bob of mass 0.5kg swings through its lowest point of travel with a speed of 0.8m/s. To what maxium vertical height will it travel?

10. An arrow of mass 0.1kg is fired vertically upwards with an intial velocity of 30m/s. Determine the:

a. Kinectic energy

b. potential energy

When its upward velocity has decreased to 10m/s.

I have the answers however im not sure how they got the answers and need to figure how to work them out thanks.