Question

HOW DOES K.E OF AN OBJECT IF a) ITS MASS IS DOUBLED,AND b) ITS SPEED IS DOUBLED

Answer 1

Answer:

Kinetic energy of a body of given mass, is directly proportiional to its square of its velocity. When momentum is doubled, mass remaining constant, this means velcity is doubled. Hence, kinetic energy becomes 22=4 times i.e. say from 100 units to 400 units.

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Answer 2

Answer:

K.E=1/2mv²

So a) it's mass is doubled

1/2×2mv²

So ratio=1/2:1 or 1/2 wher 1 is earlier one and 2 is new K.E

b)it's speed is doubled

1/2×m×2v²

1/2×m×4v²

So ratio is 1:4 where1 is earlier K.E while 4 is the new K.E

Explanation: