Question

a train is accelerating at a constant rate . it's speed is u when it s front end crosses a pole on the ground. it's speed becomes v when its rear end crosses the same pole. find it's speed when its mid point crosses the polr​

Answer 1

Answer:

ANSWER

(1) length of train :- l

When last compartment passes through pole distance covered by first compartment is l

∴v2=u2+2al

∴a=2lv2−u2

Now, when middle post passes, distance covered by first compartment is 2l

∴vf2=u2+2Ral

=u2+(2lv2−u2)l=2v2+u2

∴vf=2v2+u2