Question

If 2 persons A and B of mass M are sitting inside a bus moving with a constant velocity v. Person C is standing on the road watching the bus go.What would be the Kinetic Energy of A told by B and C respectively?

• A. $\frac{\left(m{v}^2\right)}{2}$, $\frac{\left(m{v}^2\right)}{2}$
• B. 0, $\frac{\left(m{v}^2\right)}{2}$
• C. $\frac{\left(m{v}^2\right)}{2}$, 0
• D. 0,0

Answer 1

The correct option is B 0, $\frac{\left(m{v}^2\right)}{2}$

For B: Velocity of A is 0( both are on the same bus)
therefore, KE of A for B is 0.

For C: Velocity of A is v(as the velocity of bus is v)
so, KE of A for C be $\frac{\left(m{v}^2\right)}{2}$