Question

1. How far should a man of mass 60 kg run so that his kinetic energy is 750 J?
2. Find the mass of the body which has 5 J of kinetic energy while moving at a speed​

Answer 1

Explanation:

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

E

k

=

2

1

mv

2

or v=

m

2E

k

=

60

2×750

=5m/s

Answered By

Answer 2

Answer:

by using formula ke = 1/2 mv square

ke= 750 j

m= 60 kg

750= 1/2×60×v squre

v= 5 m/s

solution of second question is

ke = 1/2 mv squre

5=1/2m×5 square

m= 0.4 kg