A 2,000-kg car traveling at 40 m/s hits a wall with a force of 40,000 N and comes to a stop. What was the impact time?

0.5 s
2 s
400 s
800 s

I can't figure out the formula for this

Question

A 2,000-kg car traveling at 40 m/s hits a wall with a force of 40,000 N and comes to a stop. What was the impact time?


0.5 s
2 s
400 s
800 s

I can't figure out the formula for this

koikkara · Answer

$F = ma $

jfraser · Answer

then \[F = m*\frac{\Delta v}{t}]\

anonymous · Answer

Just cleaning up JFraser's latex here...
$$F = m*\frac{\Delta v}{t}$$

anonymous · Answer

However, I think I should modify the formula to account for the fact that time cannot be negative in these scenarios: $$F=m \frac{| \Delta v|}{t}$$
This is because 0-40 gives us -40. When solving for t, we'll end up with a negative value.