I'm struggling with this assignment

In a typical car, a seat belt can withstand a force of about 15,000 N. What is the maximum speed you can travel that allows the seat belt to stop your motion during " collision? (Hint: convert your mass in kg) How much less would the universal gravitational force of attraction be between bumper car A and bumper car B if the distance between the cars increased from 1 m to 2 m? Assume both bumper cars have a mass of 500 kg. 7. Bumper car A is moving at 4 m/s north when it is involved in a head-on collision with bumper car B at rest. If bumper car B moves north due to this collision and bumper car A comes to a complete stop, what is the new speed of bumper car B? Assume external force is not accounted for. omIT . ev conslaid 8. Explain your answer in question 7 using the law of conservation of momentum