Please answer (b) with explaination and example. Thanks for the help. IR True or

Question

Please answer (b) with explaination and example.
Thanks for the help.

IR True or false: F a) If R is the position vector of a particle, r denotes time, and s denotes arc length, a scalar of (b A mowing particle achieves its maximum speed at the instant r 3. (Before and after that instant, its speed is less than its speed at t 3.) It follows from this that its acceleration is zero at the instant t 1 (c) The acceleration of a particle moving along a curve with binormal Bis always per pendicular to B. [More precisely, a(r) and B(t) are orthogonal for each fixed value of

Explanation / Answer

answer b ) False

since it velocity is maximum at t=3sec

it means at t= 3 sec

acceleration is changing

till t = 3sec it is accelerating and after t= 3 it is retarding

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