Question

44. A body of mass 5 kg is dropped from a height of 20 m.
(i) What are the potential and kinetic energy of a
body, when it falls through a distance of 15 m?
(ii) Find the kinetic energy of the body at the
ground level. Take g = 10 m s-2​

Answer 1

Explanation:

m=5kg

h=20m

take g=10mls

kinetic energy formula is 1/2mv2

1/2into5 into10 25 mls

now potential energy formula is hg

20into 10

200

when it falls 15m

now taking height 15m

in this case also we can use the formula kinetic energy. is same 1/2 mv2

1/2 into5into5

1/2 ^5^5

1/2^25

2/25

then the answer 12.5

hence answer in first case iz200

hence answer in second case is 12.5

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Answer 2

Answer:

(i) P.E. = 250J and K.E. = 750J

(ii) K.E. = 1000J

Explanation: