# AP Calculus

A particle is moving around the unit circle (the circle of radius 1 centered at the origin). At the point (.6, .8) the particle has horizontal velocity dx/dt=3. what is its vertical velocity dy/dt at that point?
a)-3.875
b0-3.75
c)-2.25
d03.75
e)3.875

1. 👍 0
2. 👎 0
3. 👁 170
1. x^2 + y^2 = 1
2x dx/dt + 2y dy/dt = 0
dy/dt = (-x dx/dt)/y
= -.6(3)/.8 = - 2.25

1. 👍 0
2. 👎 0
posted by Reiny

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