Question

An object of mass 521 kg, initially having a velocity of 90 m/s, decelerates to a final velocity of 14 m/s. What is the change in kinetic energy of the object, in kJ?

Answer 1

Answer:2058.992KJ

Explanation:

Given data

Mass of object$\left ( m\right )$=521kg

initial velocity$\left ( v_0\right )$=90m/s

Final velocity$\left ( v\right )$=14m/s

kinetic energy of body is given by=$\frac{1}{2}$$m$$v^{2}$

change in kinectic energy is given by substracting  final kinetic energy from initial kinetic energy of body.

Change in kinetic energy=$\frac{1}{2}\times m$$\left ( V_0^{2}-V^2\right )$

Change in kinetic energy=$\frac{1}{2}\times521$$\left ( 90^{2}-14^2\right )$

Change in kinetic energy=2058.992KJ