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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

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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` M`V^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 0.1`v2`

∴ 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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