state whether the following are examples of positive or negative accelerations. (1 mark each - 3 marks) a) An object trevelling at 10.0 m/s [E] speeds up to a velocity of 20.0 m/s [E]. I positive, b) An object travelling at -10.0 m/s [W] speeds up to a velocity of -20.0 m/s [W] positive c) An object travelling at 10,0 m/s (E] slows down to a velocity of 5.0 m/s [E]