Question

A CAR EXPENDS AN ENERGY OF 45,000J WHILE MOVING AT A CONSTANT SPEED OF 15m/s. WHAT IS MASS OF CAR? ​

Answer 1

Answer:

400 kg

Explanation:

As Kinetic Energy = $\frac{1}{2}$mv²

Given :

KE = 45,000 J

v = 15 m/s

Procedure :

45000 = $\frac{1}{2}$(m)(15²)

⇒ 45000 = $\frac{1}{2}$(m)(225)

⇒ 200 = $\frac{1}{2}$(m)

∴ m = 400 kg.

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GeniusH