At the starting gun, a runner accelerates at 1.9 for 4.8 . The runner's acceleration is zero for the rest of the race.
What is the speed of the runner at ?
What is the speed of the runner at the end of the race?
2007-10-01 17:31:46 · 3 answers · asked by razac24 1 in Science & Mathematics ➔ Physics
The speed of the runner at the end of the race would be 9.12 meters per second.
1.9 m/s² x 4.8 s = 9.12 m/s
This is equivalent to 32.832 kilometers per hour.
2007-10-01 17:42:52 · answer #1 · answered by likeahorsey 2 · 0⤊ 2⤋
Ahem!! That would be 1.9 m/s² and 4.8 seconds? Keep the units together, pup, or you'll never get anything correct.
OK v = at so v = 1.9 * 4.8 = 9.12 m/s
If the runner doesn't accelerate or decelerate during the race, her speed will still be 9.12 m/s at the end of the race.
2007-10-02 00:45:39 · answer #2 · answered by doug_donaghue 7 · 1⤊ 2⤋
/ \
/ v \
/ a t \
okay so use that triangle to help solve when you need to find v, a, or t, cover up whatever you need to find and you'll get the 3 formulas from that triangle.
Speed = velocity... therefore:
a = 1.9
t = 4.8
v = ?
v = at
v= (1.9m/s^2)(4.8s)
v = 9.12m/s <<<<<<<< speed
2007-10-02 01:39:45 · answer #3 · answered by Toasted Fart 3 · 0⤊ 1⤋