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Time and Velocity (Big Four?) 
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#1
Dec911, 05:32 PM

P: 22

A chipmunk drops an acorn from a branch 6.0 m above the ground.
a) How long is it in the air? b)How fast is it going when it hits the ground? I decided my given was a=9.8m/s^{2} d= 6.0 m v_{i}= 0 m/s So I used the distance formula (d=v_{i}+1/2*a*t^{2}) and solved for time. I got about 1.1 s. For the next part I used v_{f}=v_{i}*t+a*t and solved. I got a)1.1 seconds b) 10.78 m/s Is this correct? 


#2
Dec911, 06:07 PM

HW Helper
P: 2,316

Given that orignal data was to 2 figures only, the velocity should be rounded to 2 figures, which will give 11 in both cases. You even get the same result if you stretch to 3 figures  10.8, but if you quote 4 figures; 10.78 is incorrect. 


#3
Dec911, 06:12 PM

P: 22

Thank you so much! Highly appreciated.:)



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