Question

The mass of a person is 65 kg . How fast should he run so that his kinetic energy is 812.5 joule ?

Answer 1

K.E=0.5m$v^{2}$

812.5=0.5*65*$v^{2}$

√(812.5*2)/65=v

v=5m/s

Answer 2

Answer:

Given, mass of the man, m=60kg

Kinetic energy of the man, E

k

=750J

If v is the velocity of the man, then

K.E

=

2

1

mv

2

or v=

m

2E

k

=

60

2×750

=5m/s