If you have an expression that is in indeterminate form, you may try to factor it out. If you cannot factor it, then try multiply it with its conjugate pair.
How do car bumpers that collapse on impact help to protect a driver?
According to the law of conservation of momentum, p = mv.
Newton's 2nd Law is F = ma, or F = mv/t.
So as t increases, F would decrease, thus less force would be acting on the car at a given time interval.
Any...