An open train car, with a mass of 2050 kg, coasts along a horizontal track at the speed 2.792.79 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 2.792.79 s at the rate of 475 kg/s. What is the car's speed vf after the loading is completed? Ignore rolling friction.

A 4.4-g bullet leaves the muzzle of a rifle with a speed of 336 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.78-m-long barrel of the rifle?

A 0.400 kg hammer is moving horizontally at 4.00 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. (a) Calculate the duration of the impact in seconds.   s (b) What was the average force in newtons exerted on the nail?   N

A 1.35-kg block of wood sits at the edge of a table, 0.782 m above the floor. A 0.0105-kg bullet moving horizontally with a speed of 715 m/s embeds itself within the block. (a) What horizontal distance does the block cover before hitting the ground? (b) what are the horizontal and vertical components of its velocity when it hits the ground? (c) What is the magnitude of the velocity vector and direction at this time? (d) Draw the velocity vectors,  and the resultant velocity vector at this time.

A 6-g bullet is shot into a 2.1-kg block of wood, where it becomes embedded.  The block is initially at rest and the bullet has an initial velocity of 400 m/s.  The block then travels 1.2 m horizontally.  What is the coefficient of kinetic friction between the block and the surface?

A 14.4-g wad of sticky clay is hurled horizontally at a 71-g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides d=11 m before coming to rest. The coefficient of friction between block and surface is µk=0.56. What is the normal force caused by the ground on the block/blob (again, consider them as one mass)?         2. What is the frictional force on the block/blob?        3. What is the work done by friction on the block/blob?

A 4.0-g bullet leaves the muzzle of a rifle with a speed of 328 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.76-m-long barrel of the rifle?

Kyle, a 80.0 kg football player, leaps straight up into the air (with no horizontal velocity) to catch a pass. He catches the 0.430 kg ball precisely at the peak of his jump, when he is 0.437 m off the ground. He hits the ground 0.0358 m away from where he leapt. If the ball was moving horizontally when it was caught, how fast u was the ball traveling? Vs m/s

A 38.0 g balled is launched from ground level at an angle of 21.0° above the horizon. Its initial speed is 21.0 m/s. What is the value of px (in kg*m/s) an instant after the ball is launched? What is the value of py (in kg*m/s) an instant after the ball is launched?

A 309 g glass rolls down an incline and onto a horizontal platform where it hits a beverage can that is laying at rest on its side. The top of the incline is 11.0 cm above the horizontal platform. The beverage can is initially at rest and weighs 7.35 N. Which of following is the final velocity of the glass? Select one: a. 0.612 m / s b. −5.83 m / s c. −1.35 m / s d. −0.612 m / s