Question

A train staring from rest attain a velocity of 80km/h in 4 minutes . Find acceleration and distance travelled by the train

Answer 1

In this type of questions at first convert all given into SI units.

80 Kmh-¹ = (80×5/18) ms-¹ = 22.2 ms-¹

4 min = 240 s

Whenever any body starts from rest then its Initial Velocity becomes zero.

v = u + at

22.2 = 0 + 240a

a = 22.2/240

a = 0.0925 ms-²

S = ut + 1/2at²

S = 0 + 1/2 × 0.0925 x 240

S = 11.1 m