Calculating Acceleration a = v/t

Question 1

The cyclist decreases his speed by 11.5 ms-1 over 5s. How fast does he decelerate?

Answer 1

11. 5/5 =

2. 3ms-2

Question 2

A car is travelling at 27m/s. It increases its speed to 32m/s in 2.5 seconds. Calculate the cars acceleration.

Answer 2

32-27 = 5
5/2.5
= 2 m/s-2

Question 3

A truck is travelling at 24m/s. Entering takapuna it changes speed to 10m/s. It takes 8 seconds to make this change. Calculate acceleration.

Answer 3

10-24 = -14

• 14/8 =
• .175 m/s-2