A stone is thrown vertically upward with velocity 77 m/s. Find the time when the velocity will be 75% of the initial velocity? Your Answer: Answer units A car travels 7.7sec with speed 17.6m/s and then accelerates at 2.9m/s2 for 6.8sec. What is the average speed [in m/sec ] in the whole trip. Your Answer: Answer You throw a stone vertically upward from the roof of an 80m tall building with a velocity of 50m/s. At what velocity, the stone will hit the ground? [Assume g=10m/s2] Your