Question

How fast does a man ,weighing 60kg run so that his kinetic energy is 750 joule

Answer 1

Mass=60kg
Velocity=?
Kinetic Energy=750J
A.T.Q
=>½mv²=750J
=>½*60*v²=750
=>30*v²=750
=>v²=25
=>v=5
So he has to run with a velocity of 5m/s.

Answer 2

Answer

• Mass = 60 kg

• K.E = 750 J

• v = ?

→ K.E = (1/2)mv²

⇒ 750 = (1/2) × 60 × v²

⇒ v² = 150/6

⇒ v = √25

⇒ v = 5 m/s

∴  The man should run with a velocity of 5m/s