Question

Speed help?

Answer 1

A particle moves along a straight line with equation of motion s = f(t), where s is measured in meters and t in seconds. Find the speed when t = 5.
\[\LARGE f(t) = 100 + 50t − 4.8t^2\]

Answer 2

Differentiate it first.

Answer 3

Then plug in 5 in f'(t) to find the speed.

Answer 4

Actually that gives me the velocity, which I already got, I need the speed..

Answer 5

The speed is the same as the velocity as the particle moves on a straight line.

Answer 6

Well thank you sham~

Answer 7

mhm.