Question

How fast should a man of 50 kg run so that his kinetic energy be 625 J?

Answer 1

Explanation:

mass of man is 50 kg

K .E. is 625 joules

$kinetic \: energy \: = \frac{1}{2} m {v}^{2} \\ 625 = \frac{1}{2} \times 50 \times {v}^{2} \\ 625 = 25 {v}^{2} \\ {v}^{2} = \frac{625}{25} \\ {v}^{2} = 25 \\ v = \sqrt{25} \\ v = 5 \: m {s}^{ - 1}$

Man should run with a velocity of 5 m/s.

Please mark it as brainliest if it is helpful.

Thanks...

Follow me...

Answer 2

Answer:

k.e =0.5 mv²

v=sqrt (2k.e/m)

=sqrt (2×625 joule/50kg)

= sqrt (625 joule /25 kg)

= 5m/s