# A truck travelling at 25 m/s puts its brakes on for 4 s. This produces a deceleration of 2 m/s2. What does the truck's velocity drop to?

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by charlotteds9

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by charlotteds9

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Initial velocity(u) = 25 m/s.

acceleration (a) = -2 m/s²

time taken (t) = 4s

let the final velocity = v m/s

v = u + at

⇒ v = 25 + (-2)×4

⇒ v = 25 -8

⇒**v = 17 m/s**

acceleration (a) = -2 m/s²

time taken (t) = 4s

let the final velocity = v m/s

v = u + at

⇒ v = 25 + (-2)×4

⇒ v = 25 -8

⇒