Answer:
5412 N
Explanation:
Let's convert the velocity to metres per second. 55 miles per hour is equivalent to 24.6 metres per second.
Before the collision, the child had a momentum of [tex]mv=11 \times 24.6[/tex] where m = mass of child and v = velocity of child.
After the collision, he is brought to rest. Hence, the final momentum is 0 since the final velocity is 0.
By Newton's second law, the impulse = change in momentum. Impulse is the product of the average force and the time for which it acts.
[tex]I = Ft =mv-mu[/tex]
[tex]F\times0.05 =0-11 \times 24.6[/tex]
[tex]\F = dfrac{11 \times 24.6}{0.05}= 5412[/tex] N
