Question

If a car accelerates at 7.5 m/s², what would be its final speed after 5 seconds if its starting speed was 50 m/s?

Answer 1

Answer:

The final speed is 87.5 m/s.

Explanation:

In this problem, we are given the car's acceleration 'a', its initial speed 'u' = 50m/s, and the time taken 't' as 5 seconds. We are asked to find the final speed after 5 seconds.

We can make use of the relation v = u + at to complete this calculation, where v is the final speed, u is the initial speed, t is the time and a is the acceleration.

Now we can substitute the values we have.

$v=50m/s+7.5m/s^{2}\times 5s.\\=50m/s+37.5m/s\\ =87.5m/s.\end{aligned}$