If s = 10t2 + 10, find s, v, a at t = 2s. (5 marks)

If u1 = u2 = u for two projectiles, and these two projectiles are thrown at angles θ1 and θ2 and cover the same horizontal distance xt, so land at the same point. Find a relation between θ1 and θ2. (10 marks)

If the radius of earth is re, and its mass is me. If the earth collides with another object, and after collision, the new radius of earth is r = 4re and the new mass is m = 4me. What will happen to the terminal velocity of an object, if all the other conditions do not change. (10 marks)

If F1 = (2,4,7), and F2 = (2,1,4), then find F1 + F2, F1 − F2, F1.F2, |F1|,|F2|. (5 marks)