h.s. physics

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Consider a projectile that is thrown upward at an angle between 10 and 80 degrees from the horizontal, when are the acceleration and velocity vectors perpendicular to each other?
(Only consider the motion during free fall.)

a) nowhere
b)at the highest point
c)the launch point
d)the landing point

- i am thinking it be at the highest point ? but I want to make sure

  • h.s. physics -

    b)at the highest point

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