anonymous
  • anonymous
A rock is thrown upward with an initial velocity of 8.4 m/s. The acceleration of the rock is -9.81 m/s^2. What is the final velocity of the rock if it returns to its initial position in 1.7 seconds ?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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raffle_snaffle
  • raffle_snaffle
use one of the kinematic equations.
raffle_snaffle
  • raffle_snaffle
First draw a picture
raffle_snaffle
  • raffle_snaffle
You need to find the rocks final velocity at its maximum height. By doing this you use the givens G=9.8m/s^2, Vfinal=0, and Vintial=8.4m/s

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More answers

anonymous
  • anonymous
Does it make sense for the final velocity to come out as a negative?
raffle_snaffle
  • raffle_snaffle
Yes, because you decided downward would be negative and upward would be positive.
raffle_snaffle
  • raffle_snaffle
Look at it this way. |dw:1378440387726:dw|
raffle_snaffle
  • raffle_snaffle
I think you need to find the total distance the rock traveled when thrown into the air.
anonymous
  • anonymous
I think I've solved it using Vfinal = Vinitial + acceleration * time.
raffle_snaffle
  • raffle_snaffle
in order to find the final velocity of the rock because we are not looking for the final velocity where it reaches its maximum height.
raffle_snaffle
  • raffle_snaffle
what was your answer?
anonymous
  • anonymous
-8.3 m/s
raffle_snaffle
  • raffle_snaffle
yep sounds good. Remember velocity is a vector which has a direction, while speed is a scalar which has no direction so the negative makes sense.
anonymous
  • anonymous
Thanks for the help I appreciate it.
raffle_snaffle
  • raffle_snaffle
I would appreciate a medal.
goformit100
  • goformit100
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