Question

How much Work is done in lifting a 200N block a vertical Distance of 2.5m?
a. 400 J
b. 500 J
c. 600 J
d. 800 J

How much Work is done in pushing the same block of ice up a 5m long ramp? Only 100J of Force are needed as the block is pushed up an incline.
a. 100 J
b. 200 J
c. 300 J
d. 400 J

What is the increase in the block's Potential Energy in each case?
a. 500 J
b. 600 J
c. 700 J
d. 800 J

Answer 1

Explanation

1.

To formula to calculate the Work done is given by,

Work done = Force × distance

Here we have ,

• Force = 200 N
• distance= 2.5 m

Substitute the required vlaues

Work done = 200* 2.5

Work done = 500 J

2.

Given ,

distance = 5m

force= 100 N

so,

Work done = 100 * 5

= 500 J

3.

Potential Energy is equal to the work done by the body. Hence in both the cases, the work done is 500 J. So, the increase in potential energy in each case is 500 J.