Ahockey puck is hit on a frozen lake and starts moving with a speed of 13 m/s. seven seconds later, its speed is 6.7 m/s. what is its average acceleration? the acceleration of gravity is 9.8 m/s 2 . answer in units of m/s 2 .

-0.9 m/s²

Explanation:

t = Time taken by the hockey puck = 7 seconds

u = Initial velocity of the hockey puck = 13 m/s

v = Final velocity of the hockey puck = 6.7 m/s

a = Acceleration of the hockey puck

Equation of motion

The acceleration of the hockey puck in the seven seconds is -0.9 m/s²

The acceleration due to gravity is not needed to find the acceleration of the puck.

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that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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