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

Step-by-step 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=
`(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=
`(1)/(2)* m`
`\left ( V_0^(2)-V^2\right )`

Change in kinetic energy=
`(1)/(2)*521`
`\left ( 90^(2)-14^2\right )`

Change in kinetic energy=2058.992KJ