How fast should a man of 50 kg run so that his kinetic energy will be 625 J?
m = mass;
v = velocity/speed;
K.E. = kinetic energy
Given that m = 50kg and KE = 625
1/2(mv2) = KE
1/2(50v2) = 625
v2 =625 × 50 × 2
v = √62500
= 250m/s