Question

Your backpack has a mass of 8 kg. You drop it from a height of 1.3m. How much work is done by gravity as the backpack falls?

A. -102 J
B. -10.4 J
C. 102 J
D. 10.4 J

Answer 1

The answer is C.

Step-by-step explanation:

I guessed and it was right

Answer 2

Work done by the gravity, W = 102 J

Step-by-step explanation:

It is given that,

Mass of the backpack, m = 8 kg

It is dropped from the height of, h = 1.3 m

We have to find the work done by the gravity as the back pack fall. Work done by the gravity is given by the product of force and distance covered by an object. Mathematically, it is given by :

W = F × d

∵ F = m g

⇒ W = mg h

`W=8\ kg* 9.8\ m/s^2* 1.3\ m`

W = 101.92 Joules

or

W = 102 Joules

So, the work done by the gravity is 102 J. Hence, this is the required solution.