Question

34.
How much work is done in lifting the 100-N ball a vertical distance of 2 m?
(1) 100 J
2m
(2) 200 J
(3) 300 J
(4) 400 J
35.
How much work is done in pushing the same ball up the 4 m long ramp?
(1) 100 J
(2) 200 J
2m
(3) 300 J
4m
(4) 400 J
​

Answer 1

34) Work done = mgh = wh

w, weight = 100N

Work done = 100×2= 200J

35) work done = 100×4 = 400J

Answer 2

(34) Work done, W = 200 J

(35) Work done, W = 400 J

Explanation:

It is given that,

Force acting on the ball, F = 100 N

Vertical distance covered by the ball, h = 2 m

(a) If W is the work done by in lifting the ball in vertical direction. It is given by :

$W=F\times d$

$W=100\ N\times 2\ m$

W = 200 J

So, 200 J of work is done in lifting the 100-N ball a vertical distance of 2 m.

(b) If force, F = 100 N

If distance, d = m

Work done is given by :

$W=F\times d$

$W=100\ N\times 4\ m$

W = 400 J

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Work done

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