Me to solve this.
an automobile, the speed of which is increasing at a rate of 6.0 m/s2, travels along a circular road of radius 20m. when the instantaneous speed of the automobile is 4m/s find (a) the tangential acceleraction components and (b) the magnitude and direction of the total acceleraction

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.