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 ?

Question

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 ?

raffle_snaffle · Answer

use one of the kinematic equations.

raffle_snaffle · Answer

First draw a picture

raffle_snaffle · Answer

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

anonymous · Answer

Does it make sense for the final velocity to come out as a negative?

raffle_snaffle · Answer

Yes, because you decided downward would be negative and upward would be positive.

raffle_snaffle · Answer

Look at it this way. |dw:1378440387726:dw|