Question

calculating rebound force
imagine you are an action - movie star who is trying to break down a door by jumping into it. you have a mass of 80 kg, and you jump against the door with a speed of 6 m/s. if your velocity drops to zero in 0.2 seconds, how much force do you exert on the door?
choose the correct answer.
1600 n
2400 n
3200 n
3800 n

Explanation:

Step1: Identify the formula

We use the formula $F = ma$, and since $a=\frac{\Delta v}{\Delta t}$, then $F = m\frac{\Delta v}{\Delta t}$.

Step2: Determine the values of variables

$m = 80$ kg, $\Delta v=6 - 0=6$ m/s, $\Delta t = 0.2$ s.

Step3: Calculate the force

$F=80\times\frac{6}{0.2}=80\times30 = 2400$ N.

Answer:

2400 N