How much distance does it take to stop a car going 30 m/s (67 mph) if the brakes can apply a force equal to one half the car’s weight?

A car of mass 1650 kg, initially at a speed of 70km/h, crushes into a wall, if the accident lasted for 0.2 sec, what is the amount of force exerted in the car during the crash?

A constant force of 398 N acts on a spacecraft of mass 7830 kg that has an initial velocity of 32 m/s. How far has the spacecraft traveled when it reaches a velocity of 4930 m/s? m

as a fish jump vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. a force chinook salmon has a length of 1.50 m and a mass of 48.5 kg. if the fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 5.80 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine the following. a. the salmon's  acceleration b. the magnitude of the force F during this interval

A 2000kg truck starts at rest and reaches a speed of 15 m/s over a time period of 5s. What is the value of the force required to do this? Express answer in Newtons.

A freight train consists of two 8.00×104 kg5.60×104 kg engines and 45 cars with average masses of 5.50×104 kg5.50×104 kg. (a) What force must each engine exert backward on the track to accelerate the train at a rate of 4.00×10−2 m/s if the force of friction is 6.20×105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems. (b) What is the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?

A shopper in a supermarket pushes a loaded cart with a horizontal force of 8 N. The cart has a mass of 26 kg. (a) How far will it move in 7.0 s, starting from rest? (Ignore friction.) m(b) How far will it move in 7.0 s if the shopper places his 30 N child in the cart before he begins to push it?