Question: Suppose r(t) is a vector function. Which of the following is equivalent to(d/dt)(r(t)r(t) )? A.) r(t)xr''(t) B.) r'(t)xr''(t) C.) 0 D.) none of the above

Suppose r(t) is a vector function. Which of the following is equivalent to(d/dt)(r(t)r(t) )?

A.) r(t)xr''(t)

B.) r'(t)xr''(t)

C.) 0

D.) none of the above

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