Question

A train is travelling at a speed o
f 90 km /h.brake are applied so as to produce a uniform acc of -0.5 m/ssq find distance

Answer 1

Answer is 625

Explanation:

GIVEN, INITIAL SPEED =90 KM/H

90×(1000/3600)=25 m/s

FINAL SPEED=0 m/s

ACCELARATION =-0.5 m/sq

BY USING THE THIRD EQUATION OF MOTION

vsq=usq + 2as

0sq=(25)sq + 2×-0.5×s

0=625 -1s

1s=625

s=625/1

s=625

Therefore,distance is 625