How long would it take for a net upward force of 100.0 N to increase the velocity of a 50-kg object from 100.0 m / s to 150.0 m / s?

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?

An object has a mass of 15.3 kg and it has an initial velocity of 31.3 m/s (South) when it is acted upon by a force. The object's final velocity after the force has acted for a period of 5.20 s is 14.7 m/s (South). What is the force that acted on the object?

The froghopper holds the title of the best jumper of the animal world. A 0.0198-gram (1.98 X 10-5 kg) froghopper can accelerate from 0m/s to 4m/s in only one one thousandth of a second (0.001 s) as it jumps. What is the force delivered to the froghopper as it makes this jump?

A lump of clay of mass 0.28 kg is dropped from a height of 10.8 m. The clay comes to a full stop  0.075 s after the moment it first touched the ground. What is the magnitude in newtons of the average force of impact that the clay experienced? Express your answer in two decimal places, with units of Newtons.

You throw a ball up with the initial velocity 2.5 m/s. What is the velocity of that ball when it reaches the half of the maximum height? The mass of the ball is 0.340 kg.

Michael fell asleep while driving home from school. His 1255 kg car hit a guardrail while moving at 15.98 m/s. The guardrail exerted a 6.110E4 N force on the car for 0.1233 s. After the car hit the guardrail, how fast was it moving?

(Assume no friction forces) A train of 100 railroad cars each with a mass of 6 x 104 kg is being pulled by a locomotive that has a mass of 4.5 x 105 kg.  The train leaves the freight yard at 12:00 noon on May the 5th.  It starts from an initial velocity of 0.  It takes the locomotive 8 kilometers to get the train up to a speed of 75 km/hr.  The train then travels at an average speed of 75 km/hr for 4,200 km.  After 4,200 km the train decelerates to a stop in 20 minutes.  How long in minutes (to the nearest hundredth of a minute) did it take to reach 75 km/hr at the beginning?  How much work was done to get the train to 75 km/hr.  What was the KE of the train when it reached 75 km/hr?  How much work was done on the train during the time it traveled the 4,200 km at 75 km/hr?  What is the total distance the train traveled from beginning to end to the nearest km?  What date and time does it arrive at its destination? (Date: Hour: min)? What is the work required to stop the train? What was…