Question

A car of mass 1385 kg accelerates from rest to 20.2 m/s in 6.85 s. How much force was required to do this?

Answer 1

Given

Mass of the car, m=1385 kg

The velocity, v=20.2 m/s

Time taken is t=6.85 s

To find

The force acting

Step-by-step explanation

The acceleration is:

`\begin{gathered} a=(v)/(t) \\ \Rightarrow a=(20.2)/(6.85) \\ \Rightarrow a=2.94\text{ m/s}^2 \end{gathered}`

The force is

`\begin{gathered} F=ma \\ \Rightarrow F=1385*2.94 \\ \Rightarrow F=4071.9\text{ N} \end{gathered}`

Conclusion

The force is 4071.9 N