Question

A man of mass 60kg runs with a constant velocity. He has kinetic energy of 750 joules. calculate his velocity​

Answer 1

Given, mass of the man, m=60kg

Kinetic energy of the man, E

k

=750J

If v is the velocity of the man, then

E

k

=

2

1

mv

2

or v=

m

2E

k

=

60

2×750

=5m/s

Answer 2

`{ \bf{kinetic \: energy = (1)/(2)m {v}^(2) }} \\ { \tt{ 750= (1)/(2) * 60 * {v}^(2) }} \\ { \tt{ {v}^(2) = 25 }} \\ \\ { \tt{v = √(25) }} \\ { \bf{velocity = 5 \: m {s}^( - 1) }}`