Question

If kinetic energy of a man 40kg while running is 500J,then his velocity is

Answer 1

Answer:

5m/s.

Explanation:

given ,

kinetic energy = 500joule

we know that,

K.E = 1/2 mv^2

so,.

500 = 1/2 *40kg*v^2

1000/40 = v^2

so, velocity will be = 5m/s..

Answer 2

Solution :-

Given ,

• Kinetic energy ( K.E ) = 500 J
• Mass of man ( m ) = 40 kg

We need to find ,

• Velocity of the man = ?

As we know that ,

K.E = 1/2 m v²

Where ,

• K.E → kinetic energy = 500 J
• m → mass of man = 40 kg
• v → velocity of man = ?

By simplifying the given formula

➸ 2 ( K.E ) = mv²

➸ [ 2 ( K.E ) ]/m = v²

➸ √2(K.E)/m = v

Now , substituting the given values ,

⇒ v = √ 2 ( 500 )/40

⇒ v = √1000/40

⇒ v = √100/4

⇒ v = √10²/√2²

⇒ v = 10/2

⇒ Velocity of man = 5 m/s

Hence , velocity of man = 5 m/s