Work Honors

A 0.075-kg arrow is fired horizontally. The bowstring exerts a force on the arrow over a distance of 1.20 m. The arrow leaves the bow at 40 m/s. What average force does the bow apply to the arrow?

A 1500-kg car is driven off a 50-m cliff during a movie stunt. If it was going 20 m/s as it went off the cliff, how fast is it going as it hits the ground?

How fast must a 3000-kg elephant move to have the same kinetic energy as a 65.0-kg sprinter running at 10.0 m/s?

How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and its initial speed is 110 km/h?

If, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m above its starting point, how much thermal energy was generated by friction?

A person pulls a toboggan for a distance of 35.0 m along the snow with a rope directed 25.0° above the snow. The tension in the rope is 94.0 N. How much work is done on the toboggan by the tension force?

How much work is done if the same tension is directed parallel to the snow?

A projectile of mass 0.750 kg is shot straight up with an initial speed of 18.0 m/s. How high would it go if there were no air friction?

If the projectile rises to a maximum height of only 11.8 m, determine the magnitude of the average force due to air resistance.