The position function of a particle is x(t) = 30t −5t 2 . a. Find the velocity function x˙(t). b. Find

The position function of a particle is x(t) = 30t −5t 2
. a. Find the velocity function x˙(t). b. Find the velocity when t = 2. c. Find the velocity when t = 4. d. When is the particle stationary?​

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