Question

The mass of a person is 65kg. How fast should he run so that his KINETIC energy should be 812.5J

Answer 1

GIVEN :- mass = 65 kg, kinetic energy = 812.5 J

TO FIND :- velocity = ?

SOLUTION :- kinetic energy = 1/2mv^2

=> 812.5 = 1/2×65×v^2

=> 812.5 × 2 =65 × v^2

=> 1625 = 65 × v^2

=> 1625/65 = v^2

=> 25 = v^2

=> root 25 = v

=> 5 m/s = v

HOPE IT HELPS YOU.....