Question

2. A boy lifts a brief case upward through
(s) by applying a force (f). What is the work done
by the fonce (f)​

Answer 1

Answer:

Correct option is

B

False

No,

When a body is lifted the force of gravity is acting in the downward direction. But, the displacement of the body is in the upward direction. Since the angle between the force and displacement is 0

0

.

We know

W=F×S×cosθ

So, the Work done will be positive .

Answer 2

Explanation:

No,

When a body is lifted the force of gravity is acting in the downward direction. But, the displacement of the body is in the upward direction. Since the angle between the force and displacement is 0

0

.

We know

W=F×S×cosθ

So, the Work done will be positive .