WORK (MOVING ABOUT) (1 Viewer)

[atar90plus]

I am wondering if anyone could help me with these homework questions. Could you guys please show the full working out and solutions.

4. A man lifts the object of mass 20kg from the ground at a height of 5.5m. What is the work done by the man on the ?

5. A car of mass 5000kg accelerates from rest and reaches a velocity of 20m/s in 5 seconds. What is the work done on the car?

Thanks
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[Fizzy_Cyst]

I'm not going to do it for you, but work is simply change in energy.

4) Use GPE = mgh and determine the change in energy from when h=0 to h=5.5

5) Determine the change in Kinetic Energy of the car.

That's it.