1. While two forces act on it, a particle is to move at the constant velocity v = 3.0i - 4.0j m/s. One of the forces is F1 - 2.0i - 6.0j N. What is the other force? 2. On a dry road, a car with good tires may be able to brake with a constant deceleration of 4.92 m/s2. (a) How long does such a car, initially traveling at 24.6 m/s, take to stop? (b) How far does it travel in this time? 3. In the figure below, a stone is projected at a cliff of height h with an initial speed of 42.0 m/s directed at angle Oo = 60.0 above the horizontal. The stone strikes at A, 5.50 s after launching. Find (a) the height h of the cliff, (b) the speed of the stone just before impact at A, and (c) the maximum height H reached above the ground. H h