Question

solution for 9th class ncert book pg no 110 2nd one

Answer 1

Answer:

625m

Explanation:

u = 90 km h^-1 = (90 x 1000)/60x60 = 25ms^-1

a = -0.5 ms-2, v =0   (train is brought to rest)

v= u + at = 25 + (-0.5) x t

0 =25 – 0.5 x

0.5t = 25, or t = 25/0.5 = 50seconds

s = ut + 1/2 at2 = 25 x 50 + 1/2 x (-0.5)x502

= 1250 – 625 = 625m