Question

Jerry is riding his motorcycle at a speed of 45 m/s. He accelerates at a speed of -8 m/s² for 4seconds. How fast will he be going

Answer 1

Given

Initial speed, u=45 m/s

Acceleration

`a=-(8m)/(s^2)`

Time taken, t=4 sec

To find

The final speed

Step-by-step explanation

Let the speed he be going in be v

Thus,

`\begin{gathered} a=(v-u)/(t) \\ \Rightarrow-8=(v-45)/(4) \\ \Rightarrow-32+45=v \\ \Rightarrow v=13\text{ m/s} \end{gathered}`

Conclusion

The velocity he is going in is 13 m/s.