A van is moving with a uniform velocity of $15 m s^{- 1}$ . What is the kinetic energy of a boy of mass $40 k g$ sitting in the van?

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Solution

Step 1: Given data
Mass of boy, $m = 40 k g$
The velocity of car, $v = 15 m s^{- 1}$
Step 2: Finding the kinetic energy
$V e l o c i t y o f t h e b o y = v e l o c i t y o f t h e c a r = 15 m s^{- 1}$
$K i n e t i c e n e r g y p o s s e s s e d b y t h e b o y = \frac{1}{2} m v^{2} = \frac{1}{2} \times 40 \times 15^{2} = 4500 J$
Hence, the kinetic energy possessed by the boy is $4500 J$ .

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A van is moving with a uniform velocity of 15ms-1. What is the kinetic energy of a boy of mass 40kg sitting in the van?

Step 1: Given dataMass of boy, m=40kgThe velocity of car, v=15ms-1Step 2: Finding the kinetic energyVelocityoftheboy=velocityofthecar=15ms-1Kineticenergypossessedbytheboy=12mv2=12×40×152=4500JHence, the kinetic energy possessed by the boy is 4500J.

A van is moving with a uniform velocity of $15 m s^{- 1}$ . What is the kinetic energy of a boy of mass $40 k g$ sitting in the van?