A hockey puck is hit on a frozen lake and starts moving with a speed of 14.4 m/s. 3.0 seconds later, its speed is 7.3 m/s.
(a) What is its average acceleration?
A hockey puck is hit on a frozen lake and starts moving with a speed of 14.4 m/s. 3.0 seconds later, its speed is 7.3 m/s.
(c) How far does the puck travel during the time interval?
v=v₀+at
a= (v-v₀)/t
s= v₀t-at²/2
To find the average acceleration of the hockey puck, we can use the formula for average acceleration, which is:
Average acceleration = (final velocity - initial velocity) / time
In this case, the initial velocity (u) of the hockey puck is 14.4 m/s, the final velocity (v) is 7.3 m/s, and the time (t) is 3.0 seconds.
So, the average acceleration is:
Average acceleration = (7.3 m/s - 14.4 m/s) / 3.0 s
Now, we can calculate the average acceleration:
Average acceleration = (-7.1 m/s) / 3.0 s
Dividing -7.1 m/s by 3.0 s, we get:
Average acceleration ≈ -2.37 m/s²
Therefore, the average acceleration of the hockey puck is approximately -2.37 m/s². The negative sign indicates that the puck is decelerating or slowing down.