(D)
18.
19.
(A)
(B)
(C)
(D)
20.
(A)
(B)
(C)
(D)
21.
(A)
(B)
(A)
(B)
(C)
(D)
concave downward
A particle moves along the curve given parametrically by x = tan t and y
= 2 sin t. At the instant when , the particle’s speed equals
Suppose and y = 2 when x = 0. Use Euler’s method with two
steps to estimate y at x = 1.
1
2
3
5
Questions 20 and 21. The graph below consists of a quarter-circle and two line segments, and
represents the velocity of an object during a 6-second interval.
The object’s average speed (in units/sec) during the 6-second interval is
−1
1
The object’s acceleration (in units/sec^2 ) at t = 4.5 is
0
−1