Question

6. How is the kinetic energy of a moving car affected
if its mass is doubled and its velocity becomes
one-fourth?

7. Find the velocity of a body of mass 100 g having
a kinetic energy of 20 J.

8. What is the power of a pump which takes 20 s to
lift 400 kg of water to a water tank situated at a
height of 20 m? [Take g = 10 m/s?]​

Answer 1

Explanation:

6 ) Hence, when velocity is doubled, kinetic energy becomes 4 times

7 ) Mass of body is 100 g . v = 20 m / sec . Thus the final velocity of body is 20 m / sec .

8 ) so sorry army don't know

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