Question

A large truck travelling at +17 m/s takes 2.5 seconds to come to a complete stop at a red light. What is the acceleration of the truck?Select one:a.- 6.8 m/s^2b.+ 6.8 m/s^2c.+ 42.5 m/s^2d.- 42.5 m/s^2

Answer 1

The acceleration of the truck is -6.8 m/s².

Given data:

The inital speed is u=17 m/s.

The time taken is t=2.5 s.

The truck come to a compelet stop that means the final speed of truck is zero, i.e., v=0 m/s.

The formula for the acceleration is given by,

`\begin{gathered} a=(v-u)/(t) \\ a=\frac{0\text{ m/s-17 m/s}}{2.5\text{ s}} \\ a=-6.8\text{ m/s}^2 \end{gathered}`

Thus, the acceleration of the truck is -6.8 m/s².