19. A 60 kg man runs up a staircase in 12 seconds while a 50 kg man runs up the same
staircase in 11, seconds, the ratio of the rate of doing their work is
(a) 6:5
(b) 12:11
(c) 11:10 (d) 10:11
niformly from rest to a velocity of 54 km/hour in 5s.
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ANSWER
It is known that Rate of work done=power=Work done/time
HereP=
t
mgh
P∝
t
m
⇒
P
2
P
1
=
m
2
m
1
×
t
1
t
2
∴
P
2
P
1
=
50
60
×
12
11
=
10
11
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