- #1
Jacque77
- 14
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Homework Statement
First: My course has sig figs disabled. We are recording all that is shown in calculations. Its my instructor's choice, not mine. Please do not lecture on sig figs. I know already. ;)
Problem:
A person stands in a stationary canoe and throws a 4.85-kg stone with a velocity of +7.73 m/s at an angle of 35.3 ° above the horizontal. The person and canoe have a combined mass of 102 kg. Ignore air resistance and effects of the water and find the horizontal recoil velocity (magnitude and direction) of the person and canoe.
The Attempt at a Solution
horizontal velocity = velocity of 7.73m/s * cos 35.3 = 6.3087
mass of stone 4.58kg * horizontal velocity of 6.3087 = 28.894 kg m/s
28.894 kg m/s = 102kg * recoil velocity
28.894 / 102 = recoil velocity = -0.28327 m/s This is incorrect. What have I done wrong? The negative is for the opposite direction movement.