The problem that follow involve straight-line motion. The time t is in seconds unless otherwise stated.
Problem
In a second test, the coordinates of the position (in m) of the helicopter in Active Example 13.6 are given as functions of time by
x = 4 + 2t,
y = 4 + 4t + t2.
(a) What is the magnitude of the helicopter’s velocity at t = 3 s?
(b) What is the magnitude of the helicopter’s acceleration at t = 3 s?
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