Question

Solve the following numerical problems.
1. Calculate the work done on the body by a force of 500 N if the body moves 7.5 m in
the direction of the force.
2. Find out the magnitude of force acting on a box when 1000 J of work is done to displace it by 5 m.
3. A load of mass 30 kg is lifted up by 7.0 m. Calculate the work done. (Take g = 9.8 m s.)
4. A 20-kg ball is thrown upward with a speed of 4 m s-1.
(a) Find its potential energy when it
reaches the highest point.
(b) Calculate the maximum height it
reaches.​

Answer 1

Q2)force = 2000 N
This is the last statement of question 2

Q3) We know that when an object is raised above at certain height,
Potential energy= work done = m x g x h

m = 30 kg
g = 9.8 m/s2
h= 7 m

thus, work done = 30 x 9.8 x 7 = 2058 Joules.

I am sorry mate I don’t know question 4

Answer 2

Answer:

hey have a great day ahead