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A hockey puck is hit on a frozen lake and starts moving with a speed of 12.90 m/s. Exactly 6.7 s later, its speed is 6.70 m/s.
(a) What is the puck's average acceleration?
Incorrect: Your answer is incorrect.
m/s2
(b) What is the coefficient of kinetic friction between the puck and the ice?
To find the average acceleration of the puck, we need to use the formula:
average acceleration = (change in velocity) / (time taken)
Given that the initial velocity (vi) is 12.90 m/s and the final velocity (vf) is 6.70 m/s, we can calculate the change in velocity:
change in velocity = vf - vi = 6.70 m/s - 12.90 m/s = -6.20 m/s
The negative sign indicates that the velocity is decreasing.
The time taken is 6.7 s.
Now we can substitute the values into the formula to find the average acceleration:
average acceleration = (-6.20 m/s) / (6.7 s)
Calculating this value gives us the average acceleration of the puck.
However, please note that the correct answer will depend on the data and context provided.