Question

A van of mass 2000kg is travelling to 10 m/s. Calculate the kinetic energy, if its speed increases to 20 m/s. By how much amount does the kinetic energy increase?

Answer 1

k.e.= (1/2)×mv^2=0.5×2000×10×10=100,000unit=100kunit
speed get doubled= K.E.get quadruple
as, K.E. proportional to square of vel.

Answer 2

Hii friend !!!!!!

Its a simple question, look here ,

As u know ,kinetic energy is given by =>1/2mv^2

Here ,the initial kinetic energy is
=>1/2×2000(10)^2
=>100000 J

when its speed is increases to 20 m/s
Kinetic energy=>
1/2(2000)(20)^2
>400000 J

hence increse in kinetic energy = 400000- 100000= 300000 J