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
1 answer:
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](https://tex.z-dn.net/?f=v%3D%20i%2Bat%5C%5C%5C%5C%5CRightarrow%5C%20v%3D25%2B%28-2%29%284%5C%20%5C%20%5C%20%5B%5Ctext%7BSubstitute%20all%20values%7D%5D%5C%5C%5C%5C%5CRightarrow%5C%20v%3D25-8%5C%5C%5C%5C%5CRightarrow%5C%20v%3D17%5C%20m%2Fs)
Hence, the truck's velocity after braking = 17m/s.
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