Question

A truck is moving at 15 m/s and has a Kinetic energy of 4.2 x 105 J. a)What is the mass of the truck? b)What multiplicative factor does the kinetic energy of truck increase if its speed is double.

Answer 1

Hey!

We know that K.E. = 1/2 mv²

⇒ 4.2 × 10⁵ = 1/2 × m × (15)²

⇒ 4.2 × 10⁵ = 1/2 × m × 225

Let us keep only 'm' in the RHS,

⇒ (4.2 × 10⁵ × 2) ÷ 222 = m

⇒ m = 3733.333 kg

Hope it helps! x

Answer 2

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