(a) How much time is required for a ship to accelerate to 80 km/h from rest if its average acceleration is 3 m/s~? (3 marks) (b) A car moved on a straight road. It first moved with a constant speed of 10 m/s for 5 seconds, it then decelerated at a rate of 1 m/s and came to a stop. What was the total duration of the whole trip? (3 marks) (c) A ball is thrown directly upward with an initial speed of 0.3 m/s from 12 m above the ground. How many seconds later does the ball strike the ground? (2 marks)