A ball is thrown vertically upwards at 29.4 m/s.For its complete trip (up and back down to the starting position),its average speed is:
A) 14.7 m/s.
B) 9.80 m/s.
C) 4.90 m/s.
D) not given.

Question

Quizplus · Accepted Answer

The average speed is the total distance traveled divided by the total time taken. For the complete trip, the ball travels a distance of 2 * 29.4 m = 58.8 m. The time taken for the complete trip is the time taken to go up to the maximum height and the time taken to come back down to the starting position. The time taken to go up to the maximum height is given by:v = u + at0 = 29.4 - 9.8tt = 3 sThe time taken to come back down to the starting position is also 3 s. Therefore, the total time taken for the complete trip is 6 s.The average speed is therefore:average speed = distance traveled / time takenaverage speed = 58.8 m / 6 saverage speed = 9.8 m/s

A Ball Is Thrown Vertically Upwards at 29