Question

calculate the initial velocity when speed of train is reduced to 7m\s after 28 sec of the retardation due to brakes is 0.5 m\s square,​

Answer 1

Answer:

initial velocity = 21m/s

Explanation:

in this question we've used the the equation of motion,

v=u+at

where

v(final velocity) = 7 m/s

u (initial velocity) = ?

t=28 secs

a(acceleration due to gravity)= -0.5 m/s²(because it's retardation)

v=u+at

substituting the values

7=u+(-0.5 ×28)

7=u - 14.0

u(initial velocity) =21 m/s

hope it helps you

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