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CBSE Class 9 Answered

A truck of mass 5000kg travelling at 40m/s is brought to rest by applying breaks the truck comes to rest after travelling 20m after the application of break what is the kinetic energy of truck 
Asked by bbahu432 | 20 Sep, 2019, 07:01: PM
answered-by-expert Expert Answer

Here v=0 m/s and u= 40m/s

K.E= ½ m u2

=1/2x 5000x40 x40= 5000x20x40              

= 4x 106J

Thus, when the truck is travelling with velocity of 40 m/s its kinetic energy is 4x 106J. 
while, when the truck comes to rest the kinetic energy of the truck becomes zero. 
Answered by Shiwani Sawant | 21 Sep, 2019, 04:05: PM

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