A train with an initial velocity of 20ms^-1 is subjected to a uniform deceleration of 2ms^-2. The time required to bring the train to a complete halt is

Mediclawrence

8 years ago

v=0 , v=u+at , 0=20+(-2)t ,0=20-2t ,2t=20 ,t=20/2 ,t=10s

Kingsley1145

4 years ago

But deceleration
d = v - u/t
Where v = final velocity, U = initial velocity and T = time

Therefore d = O - 20/ 2 = -20/2 = -10s
There's possible that the question is not correct

King33Victor

3 months ago

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violettaa

7 years ago

any explanations please??

Odemosad

1 year ago

The solving there is wrong but the video is right

a = -2, v = 0, u = 20, t =?
a = (v-u) /t

t = (0 - 20) / -2
t = 10s