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A set of crash tests consists of running a test car moving at a speed of 11 m/s (24.2 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 57 kg (125.4 lbs) dummy is found to move a distance of 0.81 m from the moment the car touches the wall to the time the car is stopped. Calculate the size of the average force which acts on the dummy during that time.

I do not get this question, i have been working on it for days but i am extremely frustrated

I used the equation

v^2 + u^2 = 2as

where v = final velocity, u = initial velocity, a = acceleration, s = displacement.

so i said

0^2 + 11^2=2(a)(0.81)

It gave me the wrong answer.

but i think that i have to use mass, and my teacher has not shown me a formula in which mass is included

I do not get this question, i have been working on it for days but i am extremely frustrated

I used the equation

v^2 + u^2 = 2as

where v = final velocity, u = initial velocity, a = acceleration, s = displacement.

so i said

0^2 + 11^2=2(a)(0.81)

It gave me the wrong answer.

but i think that i have to use mass, and my teacher has not shown me a formula in which mass is included

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