Question

5 A truck travelling at 25 m/s puts on its brakes for 4 s. This produces an acceleration of –2 m/s. What is the truck's

Answer 1

Answer: The truck's velocity after braking = 17m/s.

Explanation:

Given: Initial velocity(i) = 25 m/s

Time(t)  = 4s

Acceleration(a) = -2 m/s ²

We use the following formula to compute final velocity (v):

$v= i+at\\\\\Rightarrow\ v=25+(-2)(4\ \ \ [\text{Substitute all values}]\\\\\Rightarrow\ v=25-8\\\\\Rightarrow\ v=17\ m/s$

Hence, the truck's velocity after braking = 17m/s.