Asked by Anna
A 180 g arrow is shot straight up into the air
with a speed of 17 m/s. It reaches a maximum
height of 13.7449 m.
Find the initial kinetic energy. The accel-
eration of gravity is 9.8 m/s2 .
Answer in units of J.
with a speed of 17 m/s. It reaches a maximum
height of 13.7449 m.
Find the initial kinetic energy. The accel-
eration of gravity is 9.8 m/s2 .
Answer in units of J.
Answers
Answered by
bobpursley
max height means all initial KE has turned to pe
MaxPE=max Initial KE - friction loss
initial KE= 1/2 m v^2= 1/2 .180 *17^2=26joules
Final PE= m g h= .180*9.8*13.7449=24.246J
so, a small amount of energy was lost going up,probably to air friction.
MaxPE=max Initial KE - friction loss
initial KE= 1/2 m v^2= 1/2 .180 *17^2=26joules
Final PE= m g h= .180*9.8*13.7449=24.246J
so, a small amount of energy was lost going up,probably to air friction.
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