Question

the kinetic energy of an object of mass‘m’ moving with a velocity of 5 m/sis 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

Answer 1

Answer:

Given, velocityofobject,v=5ms

−1

;

kineticenergyofanobject,E

K

=25J

E

K

=

2

1

mv

2

or 25=

2

1

×m×(5)

2

or m=

25

50

=2kg

When the velocity triples,

E

K

=

2

1

mv

2

=

2

1

×2×(15)

2

=225J