A box of mass 19 kilograms is sliding along at 1.4 meters per second. Roy pulls the box in the same direction it's moving with a 52-newton force at an angle of 28 degrees. The coefficient of kinetic friction between the box and the floor is 0.26, and Roy pulls on the box for 15 meters. What is the speed of the box when Roy just finishes pulling?

A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.350 and he exerts a constant horizontal force of 291 N on the crate (a) Find the magnitude and direction of the net force on the crate while it is on the rough surface.magnitude_____N direction (b) Find the net work done on the crate while it is on the rough surface.  _____J(c) Find the speed of the crate when it reaches the end of the rough surface. ______m/s

A block book is sitting at the top of a long ramp (124.8 cm). The ramp makes an angle of 64 degrees relative to the ground. How fast was the block moving initially if it was moving at 6.8 m/s at the bottom of the ramp? This ramp has a coefficient of friction of 0.  Round to 1 decimal.

What is the kinetic energy of a 1400 kg car traveling at 5.3 s ? m 7.4 x 10° J 2.0 x 104 J 7.3 x 10 J 2.8 x 107 J

A 13.0kg stone slides down an icy, essentially frictionless, hill that is shown in the figure. At the top of the hill, the stone is moving at 1.75m/s down the hill. While the hill is frictionless, the stone experiences friction along the level, rough ground (beyond the base of the hill) all the way to a wall. The coefficients of static and kinetic friction are 0.800 and 0.300 respectively. The stone slides along the ground for 9.15m before making contact with a long spring, which has a spring constant of 25.0N/m. (“Long” in this case means that the spring is sufficiently long to stop the stone before it hits the wall.) Will the stone move again after it has been stopped by the spring?

A 4.25 kg block is projected at 5.40 m/s up a plane that is inclined at 30.0° with the horizontal. The block slides some distance up the incline, stops turns around and slides back down to the bottom. When it reaches the bottom of the incline again, it is traveling with a speed of 3.80 m/s. If the coefficient of kinetic friction between the block and the plane is 0.500, how far up the incline did the block slide?

A man pushing a crate of mass m = 92.0 kg at a speed of  v = 0.880 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.354 and he exerts a constant horizontal force of 297 N on the crate.   (a) Find the magnitude and direction of the net force on the crate while it is on the rough surface. magnitude                                                       N direction    (b) Find the net work done on the crate while it is on the rough surface.                                    J(c) Find the speed of the crate when it reaches the end of the rough surface.                                       m/s

Use conservation of energy to solve both parts of the following problem (initial kinetic energy + initial gravitational potential energy = final kinetic energy + final gravitational potential energy): A skydiver with a mass of 80.0 kg steps out of a hot-air balloon holding at an altitude of 1.00 km and opens their parachute at an altitude of 200. m. While they’re in free-fall, there is a total drag force of 50.0 N on them. Once the parachute has opened, there is a total drag force of 3.60 kN on them. (y = 0 at 200. m) (a) How fast is the skydiver going when they open their parachute? (b) How fast will they be going once they touch down?

a tire swing is hanging from a rope of the length 5 meters long. It swings from an initial angle of 30 degrees relative to the vertical. The mass of the tire is 19k. what is the maximum tension

A girl on a skateboard (total mass of 33.6 kg) is moving at a speed of 12.0 m/s at the bottom of a long ramp. The ramp is inclined at 23° with respect to the horizontal. If she travels 14.1 m upward along the ramp before stopping, what is the net frictional force on her?