Question

Suppose a car is traveling at +22.6 m/s, and the driver sees a traffic light turn red. After 0.494 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 8.00 m/s2. What is the stopping distance of the car, as measured from the point where the driver first notices the red light?

Answer #1

A car is traveling at 13.0 m/s, and the driver sees a traffic
light turn red. After 0.590 s (the reaction time), the driver
applies the brakes, and the car decelerates at 8.00 m/s2. What is
the stopping distance of the car, as measured from the point where
the driver first sees the red light?

A driver traveling at 25 mph sees the light turn red at the
intersection. If her reaction time is 60.0 s, and the car can
decelerate at 18 ft/s2 find the stopping distance in ft of the car.
What would the stopping distance of the car were moving at 50
mph?

1.A boy jumps from rest, straight down from the top of a cliff.
He falls halfway down to the water below in 0.756 s. How much time
passes during his entire trip from the top down to the water?
Ignore air resistance. t = ?
2.An astronaut on a distant planet wants to determine its
acceleration due to gravity. The astronaut throws a rock straight
up with a velocity of +15.7 m/s and measures a time of 10.5 s
before...

A car is traveling at 60 mph on a 4%
downgrade.
Then,
the driver sees a fallen tree
250
ft
ahead. The driver applies the brakes but still crashes into the
tree. The skid marks were found to be 100 ft long,
and
the coefficient of
braking was found to equal 0.50. Neglect aerodynamic resistance and
compute the following:
a)
The driver’s perception reaction time.
b)
The crashing speed of the vehicle.

A motorist is driving at 19.2 m/s when she sees that a traffic
light 203 m ahead has just turned red. She knows that this light
stays red for 14.5 s, and she wants to reach the light just as it
turns green again. It takes her 1.1 s to step on the brakes and
begin slowing. What is her speed as she reaches the light at the
instant it turns green?

A car of mass 772 kg is traveling 26.4 m/s when the driver
applies the brakes, which lock the wheels. The car skids for 4.47 s
in the positive x-direction before coming to rest.
HINT
(a)
What is the car's acceleration (in m/s2)? (Indicate
the direction with the sign of your answer.)
m/s2
(b)
What magnitude force (in N) acted on the car during this
time?
N
(c)
How far (in m) did the car travel?
m

The driver of a car slams on the brakes when he sees a tree
blocking the road. The car slows uniformly with acceleration of
-5.10 m/s² for 4.25s, making skid marks 62.8 m long. With what
speed does the car then strike the tree? The answer to this was
3.94 m/.
From here, If the car has the same initial velocity, and if the
driver slams on the brakes at the same distance from the tree, then
what would the...

You are driving your car, and the traffic light ahead turns red.
You apply the brakes for 2.83 s, and the velocity of the car
decreases to + 4.98 m/s. The car’s deceleration has a magnitude of
2.87 m/s2 during this time. What is the car’s displacement?

The wheels on a car have a radius of 0.250 m. The car starts
from rest and the driver accelerates the car at a constant rate and
reaches a speed of 47.0 miles per hour in 7.0 s. a) Calculate the
angular acceleration of the wheels of the car. b) The driver
applies the brakes for 5.0 s which decelerates the car at a rate of
15.0 rad/s2. Calculate the total distance the car traveled during
the entire 12.0 s...

A driver on Route 15 is traveling at 50 mph (~22 m/s) when they
see a dog in the road ahead. The driver’s reaction time to apply
the brakes is 1.5 s. As the driver nears the dog they honk the horn
and thankfully the dog runs to safety on the side of the road. The
car finally comes to a stop 5 s after applying the brakes and 4 m
past where the dog had been standing. How far...

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