Question

how fast should a man of mass 50 kg run so that his kinetic energy is 2025​

Answer 1

Explanation:

k.E = 1/2mv^2

so 2025 = 1/2 *50v

2025 = 25v

v = 81 m/s

Answer 2

Answer:

The speed of the man should be 9 m/s.

Explanation:

Kinetic energy is the energy possessed by an object by virtue of its motion. The mass of the man is 50 kg and his kinetic energy is given as 2025 kgm²/s². We know that Kinetic energy, K = (mv²) / 2. From this equation, we can find the velocity of the object as:

                                           $v =\sqrt{2K/m}$

                                           $v=\sqrt{((2*2025)}/50)$

                                           $v=\sqrt{4050/50}$

                                           $v=\sqrt{81\\}$ = 9

We'll get the velocity as v = 9 m/s.