Question

The displacement (in meters) of a particle moving in a straight line is given by the equation of motion below, where t is measured in seconds.

http://www.webassign.net/cgi-bin/symimage.cgi?expr=s%20%3D%207%2Ft%5E2

(a) Find the velocity of the particle at time t = a.
m/s

(b) Find the velocity of the particle at time t = 1.
m/s

(c) Find the velocity of the particle at time t = 2.
m/s

(d) Find the velocity of the particle at time t = 3.
m/s

Answer 1

Differentiate and put your values of t in.

Answer 2

velocity is ds/dt
so differentiate your equation, then plug in values for t

Answer 3

the answer is d

Answer 4

It's not multiple choice.

Answer 5

huh? this is not a multiple choice question

Answer 6

oh

Answer 7

Have you got it loco?

Answer 8

I'm having trouble figuring out how to do it.

Answer 9

u get better i tryed

Answer 10

\[v=\frac{ds}{dt}=\frac{d(7t^{-2})}{dt}=-14t^{-3}\]That's your function for velocity, now just plug in the values of t.

Answer 11

What would the value for a be then?

Answer 12

-14/a^3

Answer 13

The way you showed is really helpful.

Answer 14

Good, glad I helped.