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 ?
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use one of the kinematic equations.
First draw a picture
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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Does it make sense for the final velocity to come out as a negative?
Yes, because you decided downward would be negative and upward would be positive.
Look at it this way. |dw:1378440387726:dw|
I think you need to find the total distance the rock traveled when thrown into the air.
I think I've solved it using Vfinal = Vinitial + acceleration * time.
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.
what was your answer?
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.
Thanks for the help I appreciate it.
I would appreciate a medal.
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