Physics question(s)?

Question

A ball rolled 12.0 m [E] in 10.0 s, hit an obstacle, and rolled straight back. After the collision, the ball rolled 8.00 m [W] in 6.00 s.

What was the average speed of the ball?

A. 1.25m/s

B. 0.250m/s

C. 1.25m/s [E]

D. 0.250m/s [E]

What was the average velocity of the ball?

A. 1.25m/s

B. 0.250m/s

C. 1.25m/s [E]

D. 0.250m.s [E]

Answer 1

The speed is the distance travelled divided by the length of time it took to get there.

Speed = (12m + 8m)/(10s + 6s) = 1.25m/s Ans. (A)

The velocity is defined as the rate at which the position changes.

Velocity = (12m - 8m)/(10s + 6s) = .25m/s [E] Ans (D)