A 70kg person with very little hair is riding a go kart, 90kg, at K1 at 11 m/s and drives directly into a rail. How far will the bumper spring compress under the collision as everything comes to a stop? The spring bumper has a spring coefficient of 500,000N/m.

Answer (d) valerie rides her bike south at 8 kilometers per hour///owen jogs south at 8 kilometers per hour ;

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.

Can give more details