A stalled car weighing 2500 kg is being pushed up a hill at constant velocity of 5 mi/h by three people. The net force on the car is (in Newtons)

A car traveling at 27.2 m/s hits a bridge abutment. A passenger in the car, who has a mass of 65.0 kg, moves forward a distance of 57.0 cm while being brought to rest by an inflated air bag. Assuming that the force that stops the passenger is constant, what is the magnitude F of this force?

A person is pushing on a car with a force of <-22,-17> and another person is pushing on a car with a force of <-14,20>. What is the magnitude of the net force?

A boat and its passengers have a combined mass of 5.10x10^2 kg. The boat is coasting into a pier at a speed of 1.00 m/s. How great a force is required to bring the boat to rest in 1.00x10^2 s?

You are pulling a 72-kg box at a constant speed of 7.4 m/s. If you're pulling the rope with a force of 300 N at an angle of 37° measured above the horizontal, what is the coefficient of friction between the box and the ground?

A 20 kg crate accelerates along a horizontal floor when it is pushed with a resultant force of 10 N parallel to the floor. How far will the crate move in 5s (starting from rest)?

Two friends push a sled on snow in opposite directions. One pushes with a force of 190 N, and the other pushes with a force of 130 N. The sled does not move. What is the net force on the sled?       (a) 320 N         (b) 60 N       (c) zero           (d) cannot be determined

A freight train has a mass of 1.7 ✕ 107 kg. If the locomotive can exert a constant pull of 6.8 ✕ 105 N, how long does it take to increase the speed of the train from rest to 84 km/h? min

Two teams of nine members each engage in a tug of war. Each of the first team’s members has an average mass of 61 kg and exerts an average force of 1359 N horizontally. Each of the second team’s members has an average mass of 73 kg and exerts an average force of 1363 N horizontally.  (a) What is the acceleration of the two teams? Give this as a positive value. (b) What is the tension in the section of rope between the teams?