- #1
Johnny56
- 1
- 0
Homework Statement
Data Collected on a Race by a Dragster
Distance (m) - 20.0 when Time (s) 0.945
Distance (m) - 400.0 when Times (s) 8.96
What is the acceleration of the dragster from the 20.0-m mark to the 400.0m mark?
(The answer book says 1.27m/s2 but i don't know how to get it )
Homework Equations
v=d/t
d= initial velocity*t+1/2at2
The Attempt at a Solution
v=20/0.945
v=21.16 m/s
(2(d-(initial velocity *t)))/t2 = a
(2(380-(21.16*8.02))/8.022 = a
(2*211.10)/64.32 = a
6.56m/s2
i know the reason why I am doing this wrong is because I am using average velocity instead of using the initial velocity but i don't know how to find instantaneous velocity without a graph and i have too little information to draw one