Solve the below problem:
Q: A motorist is traveling on a curved portion of highway of radius 350 m at a speed of 72 km/h. The brakes are suddenly applied, causing the speed to decrease at a constant rate of 1.25 m/s2. Determine the magnitude of the total acceleration of the automobile
(a) Immediately after the brakes have been applied,
(b) 4 s later.