The position of an object is given by x = at3 bt2 + ct, where a ...

[Tirant22]

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.

[rosiehomeworddo]

Answer to Question 1

D

Answer to Question 2

E

[Tirant22]

Excellent

[diana chang]

TYSM