Question

the kinetic energy of an obeject of mass m moving with the volocity of 5m/s 25 what will be the Kinectic energy if force is doubled
​

Answer 1

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

Answer 2

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Given, velocityofobject,v=5ms−1;

kineticenergyofanobject,EK=25J

EK=1/2mv^2 or 25=1/2×m×(5)2

or m=50/25=2kg

When the velocity triples,

EK=1/2mv^2=1/2×2×(15)^2=225J