In the movie Superman, Lois Lane falls from a building and is caught by the diving superhero. Assuming that Lois, with a mass of 45 kg, is falling at a terminal velocity of 59 m/s, how much force does Superman exert on her if it takes 0.4 s to slow her to a stop?

Question

If Lois can withstand a maximum acceleration of 7 g's, what minimum time should it take Superman to stop her after he begins to slow her down?

Answer 1

force*time= mass*change in velocity

solve for force.

F*time=mass*changevelocity
7g*m*time=mass*change velocity
solve for time

Answer 2

Ei = Ef
S-m*g = (m*V)/(delta t)
solve for S