In the figure here, a red car and a green car move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at X, = 0 and the green car is at x = 212 m. If the red car has a constant velocity of 20.0 km/h, the cars pass each other at x = 44.1m. On the other hand, if the red car has a constant velocity of 40.0 km/h, they pass each other at x = 76.4 m. What are (a) the initial velocity and (b) the (constant) acceleration of the green car? Include the signs. Green car X Red g car (a) Number i -37.65 ! Unit km/h (b) Number -3 ! Unit m/s^2A stone is dropped into a river from a bridge 45.0 m above the water. Another stone is thrown vertically down 2.00 s after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone? Use g=9.80 m/s2. Number i -39.12 Units m/sThe position of a particle moving along the x axis depends on the time according to the equation x = ct5 - bt", where x is in meters and t in seconds. Let c and b have numerical values 2.7 W's5 and 1.0 m/sg, respectively. From t= 0.0 s to t= 1.7 s, (a) what is the displacement of the particle? Find its velocity at times (b) 1.0 s, (c) 2.0 s, (d) 3.0 s, and (e) 4.0 5. Find its acceleration at (f) 1.0 s, (g) 2.0 s, (h) 3.0 s, and {i} 4.0 s.