physicssss

1. A 1000 kg car accidentally drops from a crane and crashes at 30 m/s to the ground below and comes to an abrupt halt. What impulse acts on the car when it crashes? (Ans: 30,000 Ns) 2. A 0.15-kg rubber ball's velocity just before impact with a floor is 6.5 m/'s down, and just after is 3.5 m/'s straight up. If the ball is in contact with the floor for 0.025 s, what is the magnitude of the force applied by the floor on the ball? (Ans: 60 N) 3. A 1500 kg car moving at a speed of 15 m/s collides with a utility pole and is brought to a rest in 0.3 secs. Find the magnitude of the force acting on the car during the collision. (Ans: 75,000 N) 4. A 50 kg mass is sitting on a frictionless surface. An unknown constant force pushes the mass for 2 seconds until the mass reaches a velocity of 3 m/s. a) What is the initial momentum of the mass? b) What is the final momentum of the mass? c) What was the force acting on the mass? d) What was the impulse acting on the mass? (Ans: (a) 0 kg m/s (b) 150 kg m/s (c) 75 N (d) 150 kg m/s) 5. A force of 30000 N is exerted for 4.00 s, on a 95,000 kg mass. (a) What is the impulse of the force for this 4.00 s? (b) What is the mass's change in momentum from this impulse? (c) What is the mass's change in velocity from this impulse? (Ans: (a) 120,000 Ns (b) 120,000ns (c) 1.263 m/s)