Homework Help: physics

Posted by abbie on Monday, October 10, 2011 at 6:56am.

A car is traveling at a constant speed of 27.1 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain, so that the two cars meet for the first time at the next exit, which is 2.81 km away?

physics - drwls, Monday, October 10, 2011 at 8:43am
To travel 2.81 km, and reach the next exit at the same time, the time spent getting there must be
t = 2810/27.1 = 103.7 s.
Require that
(1/2) a t^2 = 27.1 t, and
solve for a, using the t from above.

a = 54.2/t = 0.523 m/s^2

Answer this Question

Related Questions

Physics - At the instant the traffic light turns green, a car that has been ...
Physics - At the instant a traffic light turns green, a car starts moving with a...
Physics - The instant a traffic light turns green a car that has been waiting at...
Physics - A train is moving parallel and adjacent to a highway with a constant ...
physics - At the instant a traffic light turns green, a car starts moving with a...
physics, dynamics - Car A starts from rest at t = 0 and travels along a straight...
PHYSICS-URGENT HELP - A stationary police car emits a sound of frequency 1200 Hz...
physics - The driver of a car traveling at 30 m/s needs to quickly reduce the ...
physics - At the instant the traffic light turns green, an automobile starts ...
Physics - A car weighs 15000-N and is traveling along a highway at 27 m/s. If ...

For Further Reading

First Name:
School Subject:
Answer: