A roller coaster car speeds down a hill. At the top, it has maximum:

A `m1` kg baseball moving at `v1`m/s hits a bat and is sent back in the opposite direction at `vf` m/s. What is the change in momentum of the baseball? Give your answer in kg*m/s and round to two decimal places.

A roller coaster car of mass `m` kg starts from rest at a height of `h` m. Ignoring friction, what is its kinetic energy at the bottom?

Which of the following is always true in an isolated system (no outside forces)?

A car of mass `m` kg accelerates at `a` m/s². What net force acts on the car? Provide your answer in Newtons (N).

A wrench of length 0.3 m is used to loosen a bolt. A mechanic applies a force of 50 N perpendicular to the wrench at its end.(a) Calculate the torque applied to the bolt.(b) If the mechanic wants to double the torque without increasing the force, how long should the wrench be?

A car travels 60 km east in 1.5 h, then turns and goes 40 km west in 1.0 h. What is the average speed for the trip?

A 4000-kg freight car collides with a 6000-kg freight car at rest. After the collision, they stick together and move at 3 m/s. What was the initial speed of the 4000-kg freight car?

What is the most effective treatment option for individuals with panic disorder?  

Individuals can experience multiple specific phobias at the same time.