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ian_durrant
- 20
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[SOLVED] Kinematics in two dimensions problem
Chapter 3, Problem 20
Incorrect.
A car drives horizontally off the edge of a cliff that is 48.1 m high. The police at the scene of the accident note that the point of impact is 195 m from the base of the cliff. How fast was the car traveling when it drove off the cliff?
y=V(0)t+ (1/2)gt^2
y=(1/2)(V(0)+V)T- maybe?
Ok I think I've figured out the first part of the equation, finding out the time it took for the car to fly off the cliff- here's how I did it.
y= V(0)t+ (1/2)gt^2
-48.1= (0)t +(1/2)(-9.8)t^2
t=3.13
Here's where I think I'm messing up somewhere:
x=195 (how far the car flew off the cliff)
t=3.13 (what i got from the previous answer)
V(0)= ? (what i need to solve for)
V= 0 ( the car doesn't have any more veloicty after it crashed into something)
however, when i plug this into my equation :
x=(1/2)(V(0)+V)t, it says i didn't get the right answer. here's my math just for a double check
195=(1/2)(V(0)+0)(3.13)
195=1.57V(0)
V(0)= 124.5
Any thoughts?
Homework Statement
Chapter 3, Problem 20
Incorrect.
A car drives horizontally off the edge of a cliff that is 48.1 m high. The police at the scene of the accident note that the point of impact is 195 m from the base of the cliff. How fast was the car traveling when it drove off the cliff?
Homework Equations
y=V(0)t+ (1/2)gt^2
y=(1/2)(V(0)+V)T- maybe?
The Attempt at a Solution
Ok I think I've figured out the first part of the equation, finding out the time it took for the car to fly off the cliff- here's how I did it.
y= V(0)t+ (1/2)gt^2
-48.1= (0)t +(1/2)(-9.8)t^2
t=3.13
Here's where I think I'm messing up somewhere:
x=195 (how far the car flew off the cliff)
t=3.13 (what i got from the previous answer)
V(0)= ? (what i need to solve for)
V= 0 ( the car doesn't have any more veloicty after it crashed into something)
however, when i plug this into my equation :
x=(1/2)(V(0)+V)t, it says i didn't get the right answer. here's my math just for a double check
195=(1/2)(V(0)+0)(3.13)
195=1.57V(0)
V(0)= 124.5
Any thoughts?