Question

8.
A car and a bus are running at a same speed. If
the mass of the bus is five times the mass of the
car, what is the ratio of kinetic energy of bus to
car?

I want fully solved answer please.​

Answer 1

Answer5:1

Explanation:

As we know that ke= 1/2 mv^2 As velocity of bus and car are same so there is difference in Mass so

K.e of bus = 1/2 5×m v^2

K.e of car= 1/2 mv^2

When we solve both equation we get 5:1.

Answer 2

Answer:

Mass of bus is 5 times greater than car !

Let mass of bus is M and mass of car is m,

and

M=5m

Kinetic energy of bus is KE= 1/2 × M × V^2

and

Kinetic energy of car is Ke= 1/2 × m × V^2

Both car and bus has same velocity V

Ratio of Kinetic energy of bus to car is

5KE=Ke

=> 1/2 × M × V^2 = 1/2 × 5m × V^2

=> M=5m (proved )

so, the ratio of bus's Kinetic energy to car is

KE = 5Ke

or

KE/5Ke

or

1:5