Question

A car is running at a speed of 15 kmph While another of 50m/s Kinetic energy ratio of body after 2 sec

Answer 1

It is like one car is moving with v speed and other with 2v speed because one is 15 km/h and other is 30 km/h .

K.E=0.5×m×v

2

K.E(1st)=0.5×m×v

2

K.E(2nd)=0.5×m×(2v)

2

Hence the ratio is 0.5×m×v

2

:0.5×m×(2v)

2

=1:4

Hence the ratio is 1:4.