also another Q:
a ball started from rest and rolled down a steep driveway. At the end of 4 seconds the speed was 12m/s. What was the acceleration?
2006-11-07 04:28:11 · 3 answers · asked by !!!!!! 3 in Science & Mathematics ➔ Physics
85 * t = 40
t=40/85
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2006-11-07 04:35:23 · answer #1 · answered by odu83 7 · 0⤊ 0⤋
I'm not sure about the ball, but it took the bus approximately a half an hour to travel 40 KM. Don't ask me to explain, it just makes sense to me.
2006-11-07 12:36:37 · answer #2 · answered by Frogodo 3 · 0⤊ 0⤋
for constant speed time = distance/speed
for accleration on slope intial velocity =u=0
final velocity = v= 12m/s
time =t= 4 sec
acc= a= ?
formula v= u+at
or a= (v-u)/t = 3m/s^2
2006-11-07 12:35:19 · answer #3 · answered by Socrates 1 · 0⤊ 0⤋