Kinematics Question 378

Question: A goods train accelerating uniformly on a straight railway track, approaches an electric pole standing on the side of track. it’s engine passes the pole with velocity u and the guard’s room passes with velocity v. The middle wagon of the train passes the pole with a velocity.

Options:

A) u+v2

B) 12u2+v2

C) uv

D) (u2+v22)

Show Answer

Answer:

Correct Answer: D

Solution:

Let ‘S’ be the distance between two ends ‘a’ be the constant acceleration.

As we know v2u2=2aS or, aS=v2u22 .

Let v be velocity at mid-point.

Therefore, vc2u2=2aS2vc2=u2+aS

vc2=u2+v2u22vc=u2+v22 S



NCERT Chapter Video Solution

Dual Pane