"x = 0" is the y-axis. Why do you call it a plane?" Answer: lal = 3 and b = (1, 2, - 2). Can we know about la + b|? Explain. Answer: At time = 1.0s, Grace travels at a velocity of 14.0 m/s [W 41.0 N]. At time = 3.0s, Grace travels at a velocity of 32.0 m/s [S 23.0 E]. Find out the average acceleration of Grace (hint a = ) from t = 1.0s to 3.0s, showing its magnitude and angle to 1 decimal place. A sketch will be helpful