Asked by Melissa
An archer locks a 0.20kg arrow on a bowstring. Then the archer exerts an average force of 110N to draw the string back 0.60 m . Assume that friction is negligible .
What speed does the bow give to the arrow?
If the arrow is shot vertically upward,how high will it rise?
What speed does the bow give to the arrow?
If the arrow is shot vertically upward,how high will it rise?
Answers
Answered by
Elena
W =KE
F•s =mv(o)^2/2
v(o) = sqrt(2•F•s/m) = sqrt (2•110•0.6/0.2)= 25.7 m/s
v = v(o) - g•t,
v=0 => t = v(o)/g =25.7/9.8 =2.6 s
h =v(o) •t –g•t^2/2 = 25.7•2.6 - 9.8•(2.6)^2/2 = 33.1 m
F•s =mv(o)^2/2
v(o) = sqrt(2•F•s/m) = sqrt (2•110•0.6/0.2)= 25.7 m/s
v = v(o) - g•t,
v=0 => t = v(o)/g =25.7/9.8 =2.6 s
h =v(o) •t –g•t^2/2 = 25.7•2.6 - 9.8•(2.6)^2/2 = 33.1 m
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