Author Question: The position of an object is given by x = at3 bt2 + ct, where a = 4.1 m/s3, b = 2.2 m/s2, c = 1.7 ... (Read 32 times)

Tirant22 · **on:** Jul 29, 2018

The position of an object is given by x = at3 bt2 + ct, where a = 4.1 m/s3, b = 2.2 m/s2, c = 1.7 m/s, and x and t are in SI units. What is the instantaneous acceleration of the object when t = 0.7 s?

A) -13 m/s2
B) 2.9 m/s2
C) 4.6 m/s2
D) 13 m/s2

Question 2

As compared to Jack, Jill does twice the work in half the time. Jill's power output is

A) the same as Jack's power output.
B) one-fourth as much as Jack's power output.
C) one-half as much as Jack's power output.
D) twice Jack's power output.
E) four times Jack's power output.