In the movie Monty Python and the Holy Grail (https://openstaxcollege.org/l/21monpytmovcl) a cow is catapulted from the top of a castle wall over to the people down below. The gravitational potential energy is set to zero at ground level. The cow is launched from a spring of spring constant 1.1 × 104 N/m that is expanded 0.5 m from equilibrium. If the castle is 9.1 m tall and the mass of the cow is 110 kg, (a) what is the gravitational potential energy of the cow at the top of the castle? (b) What is the elastic spring energy of the cow before the catapult is released? (c) What is the speed of the cow right before it lands on the ground?

During terrible weather at a ski-flying world championship, a ski jumper tried to adjust for bad conditions midway down the ramp but completely lost control and tumbled wildly off the side at its bottom into a scattering crowd. The 73-kg jumper left the ramp about 45 m lower than his starting position. After hitting the ground, the jumper crashed wildly and descended down the hill another 20 vertical meters before coming to rest. Here, friction cannot be ignored. Calculate the total work done on the ski jumper to bring him to rest. Round the final answer to the nearest whole number.

A hurricane wind blows across a 8m x 17m flat roof at a speed of 135  km/h.  Calculate the force exerted on the roof.  Hint:  The thickness of the roof is small, so the change in potential energy between the inside of the house and the outside can be approximated to be zero.  ρair  =1. 28 kg/ m3 .

Two 37.0-lbm twins are playing in their backyard. One toddler is running full speed at 5.5 mph and his path will take him directly into a brick wall. His sister has climbed a 3.5-ft ladder and is perched precariously atop it. Calculate the kinetic and potential energies of the two twins with respect to their stationary destinations (the wall and the ground). Boy Girl i KE (lbf.ft) PE (lbf.ft) If potential energy is completely converted to kinetic energy during the girl's fall, how fast will she be travelling upon impact? mph

Isn't there a way to solve this by only using the work and energy?  W = F(Delta X)  W = 1/2mv_{final}^2-1/2mv_{initial}^2 Potential Energy = MGH  I understand how to solve this with regular FBD and newtons laws. I want to see the way to solve it using work and energy.

A basketball player makes a jump shot. The 0.600-kg ball is released at a height of 2.04 m above the floor with a speed of 7.43 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.17 m/s. What is the work done on the ball by air resistance, a nonconservative force?

A 35 kg trunk is pushed 8.0 m at constant speed up a 30° incline by a constant horizontal force. The coefficient of kinetic friction between the trunk and the incline is 0.18. Calculate the work done by the applied horizontal force. Calculate the work done by the weight of the trunk. How much energy was dissipated by the frictional force acting on the trunk? Now suppose the 35 kg trunk is pushed 8.0 m at constant speed up a 30° incline by a force along the plane (not as in the figure). The coefficient of kinetic friction between the trunk and the incline is 0.18. Calculate the work done by the applied force. Calculate the work done by the weight of the trunk. How much energy was dissipated by the frictional force acting on the trunk?

A 4 kg block is initially sliding up a 30° incline at 6 m/s. It slides 3 m along the surface before coming to rest.  Gravity did ____ J of work on the block during this segment of motion.   A 4 kg block is initially sliding up a 30° incline at 6 m/s. It slides 3 m along the surface before coming to rest.  Kinetic friction did ____ J of work on the block during this segment of motion.

D & E PLEASE