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Author Question: If the displacement of an object is given in SI units by Dx = -5t + t 2, at t = 2 s its velocity and ... (Read 38 times)

shofmannx20

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on: Jul 28, 2018
If the displacement of an object is given in SI units by Dx = -5t + t 2, at t = 2 s its velocity and acceleration are, respectively: (Hint: Use dimensional analysis along with the equations for motion with constant acceleration.)
 a. positive, positive.
  c. negative, negative.
  b. positive, negative.
  d. negative, positive.

Question 2

A Cessna aircraft has a liftoff speed of 120 km/hr. What minimum constant acceleration does this require if the aircraft is to be airborne after a takeoff run of 200 m?
 a. 2.31 m/s2
  c. 4.63 m/s2
  b. 2.78 m/s2
  d. 5.55 m/s2


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okolip

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Reply #1 on: Jul 28, 2018
Answer to Question 1

D

Answer to Question 2

B


shofmannx20

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Reply 2 on: Jul 28, 2018
Excellent

gcook

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Reply 3 on: Yesterday
:D TYSM

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