An object of mass 15kg is moving with a uniform velocity of 4m/s. what is the kinetic energy possessed by the object ?

Options

A. `100J`
B. `120J`
C. `130J`
D. `140J`

Answer

B

Explanation

Mass of the object, `m = 15 kg`, velocity of the object, `v = 4 m s^(-1)`. From Eq. (11.5),
`E_(k)=(1)/(2) mv^(2)`
`=(1)/(2)xx15 kgxx 4ms^(-1)xx4 ms^(-1)`
= 120 J
The kinetics of the object is 120 J.