Question

9. A stone is dropped from a certain height on earth
and it takes 12 seconds to reach the ground. If the
same stone is dropped from the same height on
moon, find the time that it will take to reach the
surface of the moon. (Ignore the air resistance).

GIVE CORRECT ANSWER
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Answer 1

Answer:

By second equation of Newton we have

S=ut+

2

1

at

2

Here u=0

a=g

S=h=1cm

For the stome in moon, g

′

=

6

g

∴h=

2×6

g

t

2

∴t=

12

g

h

=

6

sec

Answer 2

29.39 Sec






























Time taken by stone at earth t = 12 sec

at earth a = g

So H = 1/2 g t^2
H = 5 * 12^2

At moon a = 6g

So H = 1/2 g/6 t^2
144 * 5 = 1/2 * 10/6 * t^2
Thus t = 29.39 Sec