Question

1) A car with a mass of 2000 kg with an initial velocity of 10 m/s crashes into a wall. The time variation (Delta t) is 0.015 seconds. What is the change in momentum? What is the car's impulse and force? What if the car crashes into a haystack with a time variation (Delta t) of 0.15 seconds. What would then be its change in momentum, impulse and force. How about its final velocity?

2) A swing made of a 2 m plank is supporting a 3 kg mass on one side and a 50 kg mass on the other side. How close should the 50 kg mass be to the 3 kg mass in order for the system to be in equilibrium? What is the reaction force pushing up of the fulcrum (pivoting point of the swing)?

Answer 1

1.