Question

What is the work done by gravity on a 4 kg ball

a. as it goes from point B to point A?
b. As it goes from point A to C?
(horizontal distance between A and B is 8 m; between B and C is 3.2 m)

Answer 1

a. Work done = 313.92 Joules

b. Work done = 439.49 Joules

Step-by-step explanation:

Work done = Force x distance

Where: Force = mass x gravity

Thus,

Work done = Force x gravity x distance

The earth's acceleration to gravity = 9.81 m/
`s^(2)`.

a. The work done as it goes from B to A can be determined as;

work done = 4 x 9.81 x 8

= 313.92 Joules

b. The distance between A and C is the total horizontal distance covered from A to C.

i.e 8 + 3.2 = 11.2 m

The work done as the ball goes from point A to C can be determined as:

work done = 4 x 9.81 x 11.2

= 439.488

work done = 439.49 Joules