Q. A simple harmonic oscillator consists of a block of mass 3.50 kg attached to a spring of spring constant 210 N/m. When t = 2.30 s, the position and velocity of the block are x = 0.140 m and v = 2.810 m/s. (a) What is the amplitude of the oscillations? What were the (b) position and (c) velocity of the block at t = 0 s?

Q. Two carts with masses of 4.80 kg and 2.78 kg move toward each other on a frictionless track with speeds of 4.94 m/s and 3.17 m/s respectively. The carts stick together after colliding head-on. Find the final speed.