Question

How fast should a man weighing 600 N run so that his kinetic energy is 750 J?

Answer 1

Answer:

5m/s.

Explanation:

We know that,

Weight (W) = Mass(m) × Gravity(g)

On substituting given values, we have,

600 = 10m

m = 60kg

We know that,

Kinetic Energy (K.E) = 1/2 × mass(m) × {velocity(v)}²

On substituting given values, we have,

750 = 1/2 × 60 × v²

v² = 750/30

v² = 25

v = 5m/s

Therefore, the man should should run with a velocity of 5 meter per second.

Hope it helps you.

Good Luck

Answer 2

$\huge\fcolorbox{red}{cyan}{Velocity\:=\:5\:m/s}$

Explanation:

• Mass(m) => Weight/10 = 60 kg

• Kinetic Energy(K.E) = 750 J

• Velocity = ?

$\boxed { \bf \color{red}{K.E \: = \frac{1}{2} \times m \times {v}^{2} } } \\ = > \frac{1}{2} \times 60 \times {v}^{2} = 750 \\ = > 30 \times {v}^{2} = 750 \\ = > {v}^{2} = \frac{750}{30} \\ = > {v}^{2} = 25 \\ = > v = \sqrt{25} \\ = > \boxed{v = 5 \: \: }$