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a hockey puck is hit on a frozen lake and starts moving with a speed of 13.20 m/s. exactly 5.6 s later, its speed is 6.60 m/s. what is the puck's average acceleration?



Answer :

Tutorconsortium412

-1.17 is the average acceleration when a hockey puck is hit on a frozen lake and starts moving with a speed of 13.20 m/s. Perfectly,5.6 s later, its speed is 6.60 m/s.

What is an average acceleration?

  • The rate of change in velocity, or the change in velocity per unit time, is known as average acceleration.
  • The square of the distance over time is used to measure acceleration. Hence, the unit of acceleration is known to be as m/[tex]s^{2}[/tex].
  • Average is read as a symbol with a bar over it, so a-bar represents average acceleration.

Solution:

Given:

  1. Initial sped =13.20m/s
  2. Final speed=6.60m/s
  3. time taken=5.6s

Now, to find the average acceleration we use the following formula;

Acceleration, [tex]a_{avg}[/tex] =[tex]\frac{v^{final}-v^{initial} }{time}[/tex]

⇒[tex]a_{avg}[/tex]=6.60-13.20/5.6 = -1.17m/[tex]s^{2}[/tex]

Hence, -1.17 is the average acceleration when a hockey puck is hit on a frozen lake and starts moving with a speed of 13.20 m/s.Perfectly, 5.6 s later, its speed is 6.60 m/s.

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