2. A hockey player is skating in a straight line at 1.5 m/s. He then increases his speed to 7 m/s in 3 s. What is his average acceleration during this 3 s?
To find the average acceleration of the hockey player during the 3 seconds, we can use the following formula:
average acceleration (a) = (final velocity - initial velocity) / time
In this case, the initial velocity is 1.5 m/s, the final velocity is 7 m/s, and the time is 3 seconds.
So, plugging in these values into the formula, we get:
a = (7 m/s - 1.5 m/s) / 3 s
Now, let's do the calculation:
a = (5.5 m/s) / 3 s
Dividing 5.5 m/s by 3 seconds, we get:
a ≈ 1.83 m/s²
Therefore, the average acceleration of the hockey player during the 3 seconds is approximately 1.83 m/s².