A block of mass m = 7.30 kg is released from rest from point and slides on the frictionless track shown in the figure below. (Assume h₂ = 7.80 m.) A h₂ m 3.20 m 2.00 m i (a) Determine the block's speed at points and Ⓒ. point B point C m/s m/s (b) Determine the net work done by the gravitational force on the block as it moves from point A to point C

A small block of mass 200 g starts at rest at A and slides along a curved frictionless track surface to B, then slides along the horizontal surface a distance 10 m before coming to rest at C due to friction between B and C. Find its speed at B and the work done by friction along the horizontal surface from B to C. 4.0 m B -10 m-

Current Attempt in Progress A particle, starting from point A in the drawing (the height at A is 3.00 m), is projected down the curved runway. Upon leaving the runway at point B, the particle is traveling straight upward and reaches a height of 6.39 above the floor before falling back down. Ignoring friction and air resistance, find the speed of the particle at point A. B

1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?