Question

16.
If the Kinetic Energy possessed by a man of 50 kg is
625 J, the speed of man is
​

Answer 1

Explanation:

$kinetic \: energy \: = 1 \div 2mv {}^{2} \\ 625j \: \: = 1 \div 2 \times 50 \times v {}^{2} \\ 1250 = 50v {}^{2} \\ v {}^{2} = 25 \\ v = 5m \: per \: sec$

Answer 2

Given:-

• Mass of man (m) = 50kg

• Kinetic energy (K) = 625J

To Find:-

• Speed of man (v)

Solution:-

As we know that , The energy produce by by motion of an object is called Kinetic Energy.

→ K = 1/2mv²

Substitute the value we get

→ 625 = 1/2×50×v²

→ 625 = 25 ×v²

→ 625/25 = v²

→ 25 = v²

→ v = √25

→ v = 5m/s

∴ The speed of the man is 5m/s.