Consider a thrown ball which has reached its highest point in fight. The magnitu
ID: 1527441 • Letter: C
Question
Consider a thrown ball which has reached its highest point in fight. The magnitude of the acceleration is zero. is less than it will be a short instant later. is 2 eg. is g. reverses direction. A displacement vector is 34.0 nm in length and is directed 60.0 degree east of north. What are the components of this vector? Choice 1 Choice 2 Choice 3 Choice 4 Choice 5 An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of 15 m/s^2. How much time does it take for the complete increase in speed? 17.3_s 8.0_s 0.0577_s 4.0_s 0.25_s If vector A^rightarrow = -3.0 xcirc - 4.0 ycirc, and vector B^rightarrow = +3.0 xcirc - 8.0 ycirc, then the magnitude of vector C^rightarrow = A^rightarrow - B^rightarrow is 3.0 13.4 16 144 7.2 A motorist travels for 3.0 h at 80 km/h and 4.0 h at 60 km/h. What is her average speed for the trip? 140 km/h 74 km/h 73 km/h 70 km/h 69 km/hExplanation / Answer
13) aceleration is always acceleration due to gravity.
a = - g m/s^2
Ans(D)
14) rNorth = 34 cos60 = 17 m
r_east = 34 sin60 = 29.4 m
Ans(D)
15) vf = vi + a t
160 = 100 + 15t
t = 4 s
Ans(D)
16) C = A - B = -6 x^ + 4y^
magnitude = sqrt(6^2 + 4^2) = 7.2
Ans(E)
17) Average speed = total distance / total time
= [ (3 x 80) + ( 4 x 60)] / (3 + 4)
= 68.5 km/h
Ans(E)