Finding Final Velocity by Energy Techniques

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Homework Help Overview

The problem involves a snowball being fired from a cliff, requiring the use of energy techniques to find its final speed upon reaching the ground. The context includes concepts from mechanics, particularly energy conservation.

Discussion Character

  • Exploratory, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to apply the conservation of energy principle but questions the incorporation of the angle in their calculations. Other participants suggest that the technique is correct and imply that a calculation error may have occurred.

Discussion Status

Participants are engaged in verifying the approach and discussing potential errors in calculations. While one participant suggests a specific answer, there is no explicit consensus on the method used, as the original poster is still uncertain about the angle's role.

Contextual Notes

The original poster expresses uncertainty about their calculations and the relevance of the angle in the energy equation. There is an implication of a possible mistake in the use of the calculator.

GingerBread27
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A 1.50 kg snowball is fired from a cliff 13.5 m high with an initial velocity of 14.0 m/s, directed 41.0° above the horizontal.
(a) Using energy techniques, rather than techniques of Chapter 4, find the speed of the snowball as it reaches the ground below the cliff.
ok so I used the equation k1+u1=k2=u2
plugging in numbers i did 1/2(1.50kg)(14m/s)^2+(1.50kg)(9.8m/s^2)(13.5m)=1/2(1.50kg)(vf)^2+(1.50kg)(9.8m/s)(0). Then I solve for Vf and I get a wrong answer. Now i realize this is probably wrong since I haven't incorporated the angle, but I'm not sure. Any ideas?
 
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Well. The technique is right, so you must've made some silly error in solving for Vf.
What answer did you get? It should be 21.5 m/s.
 
Yeah 21.5 is the answer, guess I must have made a mistake with the calculator :blushing: . Thank You :smile:
 
Hey GingerBread27 please check your private messages...thanks!
 
GingerBread27 check your private messages 1 more time...thanks
 

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