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Current Attempt in Progress Q1 Flying Circus of Physics An ion's position vector is initially 7 = (-8.4 m )7+ (-9.0 m )7 + (6.1 m ) k. and 7.2s later it is 7 = (-2.1 m )i+ (6.3 m )7 + (8.8 m )k. Inunit-vector notation, what is its average velocity during the 7.2s? Number i k Units Current Attempt in Progress Q2 A proton initially has D = (-1.40 )i + (10.0 )7 + (5.90 ) k and then 8.00 s later has 7 = (14.0 )7 + (10.0) 7 + (-13.0) k (in meters per second). (a) For that 8.00 s, what is the proton's average acceleration d avg in unit vector notation, (b) in magnitude, and (c) the angle between a avg and the positive direction of the x axis? (a) Number it i k Units (b) Number Units (c) Number i Units Current Attempt in Progress Q3 The velocity u of a particle moving in the xy plane is given by U = ( 5.50 1 - 5.00 2)i + 9.00 j, with u in meters per second and t (> 0) in seconds. At t = 1.40 s and in unit-vector notation, what are (a) the x component and (b) the y component of the acceleration? (c) When (if ever) is the acceleration zero? (d) At what positive time does the speed equal 10.0 m/s? (a) Number Unit (b) Number Unit (c) Number Unit (d) Number i Unit C