Part B As stated in the strategy,choose a cordinate syatem where the xai horizon

Question

Part B As stated in the strategy,choose a cordinate syatem where the xai horizontal and they aia is vertical. Note that in the strategy, the y component of the projectile's acceleration, ay, is taken to be negative. This implies that the positive y axis is upward. Use the same convention for your y axis, and take the positive x axis to be to the right. Where you choose your origin doesn't change the answer to the question, but choosing an origin quantities you are given and the quantity you are trying to solve for take positive values relative to your chosen origin. Given this goal, what location for the origin of the coordinate system would make this problem easiest? At ground level below the point where the rock is launched At the point where the rock strikes the ground t ground level below the peak of the trajectory OAt the point where the rock is released At the peak of the trajectory

Explanation / Answer

B. Ans: At ground level below the point where the rock is launched.

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2nd diagram

1. Incorrect, because a is downward not upward.

2. correct

3. as there is horizontal component of velocity and there is no acceleration in horizontal so velocity will never be vertical.

4. same reason as 3.

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in horizontal, v_x = 7.50 cos30

d = 15.5 m

a_x= 0

so t = d / a_x = 2.39 sec

in vertical applying, yf - yi = v0y t + ay t^2 / 2

0 - h = (7.50 sin30 2.39) + (-9.8 x 2.39^2 / 2)

h = 19 m

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