Posted by jenny on Thursday, December 22, 2011 at 9:24am.
Driving in a car with a constant velocity of 11.4 m/s you suddenly see an obstacle ahead. Immediately applying the brakes the car slows with an acceleration of 3.80 m/s2.
(i) Calculate the stopping distance of the car, and
(ii) the time taken to stop.
physics - drwls, Thursday, December 22, 2011 at 9:31am
Do step (ii) first.
(ii) Vo = a*t
t = 11.4/3.80 seconds
(i) Stopping distance = (avg. velocity)*t
= (Vo/2)*(Vo/a) = Vo^2/(2 a)
You could do question (i) first using
Vo^2 = 2 a X
but I find it more difficult to remember that formula.
physics - jenny, Thursday, December 22, 2011 at 9:49am
thanks alot :D i got 3s for t for part 2!! nd i got 17.1s for part1 is dat correct??
physics - drwls, Thursday, December 22, 2011 at 4:49pm
physics - Henry, Friday, December 23, 2011 at 4:00pm
Answer This Question
More Related Questions
- Physics - Problem 4- Speedy car, driving at 30 m/s. The driver suddenly observes...
- Mechanics NYA - Assume you are driving a car at a constant speed of 75.0 km/h. ...
- jabu - the driver of a car travelling at 100km/hr suddenly sight an obstacle 50m...
- Physics - A car is driving with a velocity of 108km/h suddenly a child crosses ...
- physics - A car is traveling at a constant velocity of 21 m/s (about 45 mph). ...
- physics - The driver of a car, traveling at a constant 25 m/s, sees a child ...
- physics - The driver of the car traveling at a constant 25m/s sees a child ...
- physics - You are driving at the speed of 34.3 m/s (76.7433 mph) when suddenly ...
- physics - I'm a hurry to go to work today because I forgot to set my alarm clock...
- Physics - You are driving your car, and the traffic light ahead turns red. You ...