Calc Based Physics problem

  • #1
possum30540
19
1

Homework Statement



An objects position as a function of time is given by r=12ti+(15t-5.0t^2)jm, where t is time in seconds. A: what is the onject's position at t=2 s. B what is its average velocity in the interval from t=o to t=2.0s.C: what is its instantaneous velocity at t=2?

Homework Equations



Derivative:12i+(15-10t)

V=change in r/change t

The Attempt at a Solution


A: simply plug 2 in for t in the original equation
B:take the derivative of the problem and plug in 2 for t
C: Dont really know . . .
 

Answers and Replies

  • #2
Doc Al
Mentor
45,465
1,956
A: simply plug 2 in for t in the original equation
OK.
B:take the derivative of the problem and plug in 2 for t
No derivatives needed, since you want the average velocity. (Use the formula you quoted.)
C: Dont really know . . .
Here's where you need a derivative.
 

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