Question

The driver of a one ton car traveling at 126 km/hr
suddenly used his brake to stop before

hitting a stationary lorry ahead. After the brakes are applied, a
constant kinetic friction

force of magnitude 8 kilo Newton acts on the car. Ignore air
resistance. (a) At what

minimum distance should the brakes be applied to avoid a collision
with the other

vehicle? (b) If the distance between the vehicles is initially only
30.0 m, at what speed

would the collision occur?

Answer #1

A driver is traveling 120 km/h on a road with a negative 1%
grade. There is a stalled car on the road 310 m ahead of the
driver. The driver's vehicle has a braking efficiency of 90%, and
it has antilock brakes. The road is in good condition. What is the
minimum distance from the stalled car at which the driver could
apply the brakes and still stop before hitting it? (Assume
theoretical stopping distance, ignore air resistance, and frl...

A car is traveling up a 1.5% grade at 65 mi/hr on good, wet
pavement. The driver brakes to try to avoid hitting a cone on the
road that is 300 ft ahead. The driver’s reaction time is 1.5
second. When the driver first applies the brakes, a software flaw
causes the braking efficiency to lower to 0.8 for 100 ft. After the
initial 100 ft, the braking efficiency returns to 1.0. How fast
will the driver be going when...

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