Question

How fast should a man weighing 600 N run so that his kinetic energy is 750 J?( g= 10 m/s2
)​

Answer 1

Answer:

5 m/s.

Explanation:

We have,

• Weight (mg) = 600 N
• Kinetic energy (K.E) = 750 J
• Acceleration due to gravity = 10 m/s²

To find,

• Velocity/Speed.

Solution,

>> W = mg

=> 600 = m(10)

=> 600 = 10m

=> m = 600/10

∴ m = 60 Kg

___________________

>> K.E = 1/2 × mv²

=> 750 = 1/2 × 60 × v²

=> 750 = 30v²

=> v² = 750/30

=> v² = 25

=> v = √25

∴ v = 5 m/s