Question

If a boy covers a distance of 20 metre in 4 minutes with a
foree of 600 N, then the power consumed by the boy is :
(a) 50 W (b) 100 W (c) 80 W (d) 25 W​

Answer 1

Answer :-

The power consumed by the boy is 50 W.

Explanation :-

Given :-

• Force = 600 N
• Time = 4 minutes = 240 seconds
• Displacement = 20 m

Now,

Work done = Force × Displacement

= 600 × 20

= 12000 J

Then,

Power consumed = Work done/Time

= 12000/240

= 50 W

Hence, the correct option is (a) 50 W

Answer 2

Explanation:

We know that

power = work done/time

work done = F.S

=600.20

=12000 J

power = wd/t

= 12000/4 ×60

= 12000/240

= 50J/s

wkt 1 j/s = 1 watt