Question

A boy of mass 55 kg and he is carrying a load of 5 kg on his head.
(i) If he is walking along horizontally through 8 m then the work done by
gravitational force is
(a) 6400 J (b) 640 J (c) 1600 J (d) 160 J
(ii) If he is waiting for his friend from 10 Minutes onwards so work done by man is
(a) 600 J (b) 6000 J (c) 4800 J (d) zero
(iii)If he is climbing a height 2 m then work done by gravitational force is
(a) 1600 J (b) 60 J (c) 1000 J (d) 100 J
(iv) If he is running with a velocity 10 meters then find kinetic energy he gained .

Answer 1

Answer:

1 ka (a)

2 ka (d)

3 ka (b)

4 ka (c)