Q1. Far in space, where gravity is negligible, a 450 kg rocket travelling at 77 m/s fires its engines. The thrust force as a function of time with horizontal axis in 9 s increments. The mass lost by the rocket during these 25 s is negligible.
(a) What impulse does the engine impart to rocket?
(b) At what time does the rocket reach its maximum speed?
(c)What is the greatest speed?
Q2. A baseball is thrown straight up. The drag force is proportional to .In terms of, what is the y-component of ball's acceleration when its speed is half its terminal speed and it is moving up?