a body at rest is given an initial uniform acceleration of 8.0ms^-2 for the next 20sec . the body maintains the speed attained for 60sec after which it is brought to rest in 20sec .draw the velocity time graph of motion using the information give above (a)maximum speed attained during the motion (b)average retardation as the body is being brought to rest (c) total distance travelled during the 50sec (d)average speed during the same interval​