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An object undergoes acceleration of 2.3i+3.6j m/s^2 over a 10s interval. At the end of this time, its velocity is 33i+15j m/s.

A. What was its velocity at the beginning of the 10s interval?

B. By how much did its speed change?

C. By how much did its direction change?

I know how to do part A, as I did it like this:

(2.3i+3.6j)10=23i+36j ; 33i+15j-23i-36j=10i-21j

I am stumped on parts 2 and 3, I need help on where to begin on those.

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# Homework Help: Acceleration/Velocity vectors question

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