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# Two Toy-cars a and Bof Masses 200 G and 500 G Respectively Are Moving with the Same Speed. Which of the Two Has Greater Kinetic Energy ? - ICSE Class 8 - Physics

ConceptKinetic Energy:Basic Concept

#### Question

Two toy-cars A and Bof masses 200 g and 500 g respectively are moving with the same speed. Which of the two has greater kinetic energy ?

#### Solution

CAR A                                           CAR B

mas= 200g                                      mass = 500 g

=200/1000=1/5 kg                                   =500/1000=0.5 kg

=0.2kg

K.E.=1/2 MV^2                                             ∴  speed of both cars is same

K.E. =1/2× 0.2 ×V^2                                     K.E. of B=1/2 ×0.5× V^2

=0.1 v^2                                                              =0.25 v^2

0.25 v^2 is greater than 0.1v2

∴ K.E. of car B is greater.
Or
Since speed of both cars is same
∴ The speed of car having greater mass (i.e. of car B), the K.E. is greater
∴  Kinetic energy of car B having greater mass is greater.

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Solution Two Toy-cars a and Bof Masses 200 G and 500 G Respectively Are Moving with the Same Speed. Which of the Two Has Greater Kinetic Energy ? Concept: Kinetic Energy:Basic Concept.
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