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What is the average force on a 75 kg crash test dummy that crashes into a wall at 25 m per s and is brought to rest in 1s?
Let's use a combination of two equations F= ma and v= u + at where F= Force; m= mass; a= acceleration; v = final velocity= 0 m/s; u= initial velocity=25 m/s and t= time.
From the equation v= u + at, we can solve for a. So, a = (v-u)/ t.
Using
F= ma
F= m((v- u)/t))
F= 75kg((0-25 m/s)/ ls)
F= (75 x 25) kg m/s^2
F= 1875 kg m/s^2= 1875 N
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