Question

a vehicle of mass 300 kg is moving with a velocity of 27 kilometre per hour. It then increases its velocity to 36 kilometre per hour. calculate (1.)the initial kinetic energy and (2.)the gain in the kinetic energy​

Answer 1

Explanation:

1.)(a) Given, mass (m) =300kg

And Velocity 1 (v1) =27km/h i.e 7.5m/s

So. K.e 1=1/2*m*v1 sq.

Therefore, K.e 1=1/2*300*7.5*7.5=8437.5Joule

Hence,initial K. e=8437.5J.........(1)

(b) Now, again mass (m) =300kg

And velocity 2 (v2) =36km/h i.e 10m/s

Therefore, k.e 2=1/2*300*10*10=15000J

Hence,Final k.e=15000J.............(2)

2.)Now, Gain in kinetic energy = final k.e -initial k.e

= 15000J -8437.5J

=6562.5J

Hope, You understand.....