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stevenwho
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Kinematic Equations... Constant Speed
Question 1) A car pulls away from an intersection when the light turns green. After uniformly accelerating for the next 4.0s, the car has traveled a distance of 50m. The car then proceeds at constant speed.
1. What was the car's acceleration
2. How fast was the car traveleing when it finished accelerating
3. How long will it take for the car to travel another 50 m at this constant speed?
The 5 kinematic equations
For #1... I used a kinematic equation and I found this info
Initial Velocity = 0
Time = 45s
X = 50
a = ?
X = distance
a = acceleration
So then I used x=intitial velocity + acceleration*time
and got 1.11m/s... Am I right?
For #2... I found
Initial Velocity = 0
Time = 4 seconds
X = 50 minutes
a = 1.11m/s
V= ?
Would objects position at time = 0 be relevant here?
I got a answer of 14.72 m/s... Is that right?
For #3
I said X= 100 (50 m + 50 m)
said initial velocity = 0
a = 1.11m/s
t = ?
I got t = 90s... Kind of makes sense, 14.72m/s + 90s = 104 something M...
? - the unknown. Please help :D
Thanks
Homework Statement
Question 1) A car pulls away from an intersection when the light turns green. After uniformly accelerating for the next 4.0s, the car has traveled a distance of 50m. The car then proceeds at constant speed.
1. What was the car's acceleration
2. How fast was the car traveleing when it finished accelerating
3. How long will it take for the car to travel another 50 m at this constant speed?
Homework Equations
The 5 kinematic equations
The Attempt at a Solution
For #1... I used a kinematic equation and I found this info
Initial Velocity = 0
Time = 45s
X = 50
a = ?
X = distance
a = acceleration
So then I used x=intitial velocity + acceleration*time
and got 1.11m/s... Am I right?
For #2... I found
Initial Velocity = 0
Time = 4 seconds
X = 50 minutes
a = 1.11m/s
V= ?
Would objects position at time = 0 be relevant here?
I got a answer of 14.72 m/s... Is that right?
For #3
I said X= 100 (50 m + 50 m)
said initial velocity = 0
a = 1.11m/s
t = ?
I got t = 90s... Kind of makes sense, 14.72m/s + 90s = 104 something M...
? - the unknown. Please help :D
Thanks
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