1.

A car is moving with a velocity of 54 km/h.the kinetic energy of a boy of mass 40 kg sitting in the car is ​

Answer»

locity of the car = 54 km/hMass of the boy = 40 kgTo findKinetic ENERGY of the boySolutionFirstly, we will convert the velocity of the car from km/h to m/s.For converting it to m/s, multiply the VALUE by 5/18.⟼ 54 × 5/18⟼ 15 m/s❖ Velocity of the car = 15 m/sFormula to be used :-❖ KE = 1/2 mv²Where, m = mass of the boyv = velocity of the carSubstituting the given VALUES, ⟼ KE = 1/2 × 40 × (15)²⟼ KE = 20 × 15 × 15 ⟼ KE = 4500 J ❖ Kinetic energy of the boy = 4500 J



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