Flying Circus of Physics An ion's position vector is initially 7 = (-8.2 m )i+ (-4.0 m ) j + (4.3 m ) k, and 2.2 s later it is 7 = (-9.4 m i+ (9.9 m )j+ (-4.4 m )k. In unit-vector notation, what is its average velocity during the 2.2 s? N. ) Number i i 1 k Units + +A proton initially has v = (-8.90 )i + (-20.0 ) j + (-9.60 ) k and then 2.20 s later has v = (-6.10 )i + (-20.0 ) 7 + (7.20 )k (in meters per second). (a) For that 2.20 s, what is the proton's average acceleration a ave in unit vector notation, (b) in magnitude, and (c) the angle between a avg and the positive direction of the x axis? (a) Number i it i k Units (b) Number i Units (c) Number UnitsThe velocity u of a particle moving in the xy plane is given by v = ( 5.50 t - 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 i i Unit (b) Number i j Unit (c) Number i Unit (d) Number Unit