Saw Variable Speed

Saw Variable Speed

Physics: How to find Off an object given certain variables ?!?!?!?

Suppose you are driving on the interstate in 82 mph, when you see a highway patrol cars parked front. You apply the brakes, slowing at a constant speed of 3.8 mph / sec, while not reduce speed to 65 mph. After maintaining a constant speed of 65 mph. Patrol car runs 14 seconds, after the initial brakes are applied and were released that he did not withdraw after you. How far is a highway patrol car, when I first saw it? None of these responses appear to be true

here time taken = T = t1 + t2 = t1 14sec = time required to reduce speed to 65 mph t2 = is the time at a constant speed if A brake section applies, achieved a speed of point (B) and petrol car passes the point (c) after This time from point A to B is t1 and the time of B and C is for t2 A to point B U = 82 V = 65 a = 3,8 V = U-, or 65 = 82 3.8 t or3.8t = 82-65 = 17 or t = 17/3.8 = 4.47sec t1 = 4.47sec now V ^ 2 = U ^ 2-2as or 65 ^ 2 = 82 ^ 2-2 * 3.8 * is or4225 = 6724-7.6s or7.6s = 6724-4225 = 2499 or S = 2499/7.6 = 328.81mt covered in t1 seconds or 4.47sec in t2 seconds it applies at a constant speed 65 mph S = VT or S = 65 * 9.53 = 619.45 m [t2 = 14-4.47 = 9.53sec] Total distnce covered 328.81 619.45 = 948.26mt