A child of mass 40kg jumps of a wall and hits the ground at 4m/s he bends his knees and stops in 1 second calculate the force required to slow him down how would this force be different knees stopped o.1 second
The force required to slow the child down is equal to the mass of the child multiplied by the change in velocity over the time interval. In this case, the force required is equal to 40kg x (4m/s - 0m/s) / 1s = 40kg x 4m/s = 160N.
If the child had stopped in 0.1 seconds, the force required would be 40kg x (4m/s - 0m/s) / 0.1s = 400N, which is four times greater than the force required to stop in 1 second.