ok, hw question 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.