Physics on road.
A man on a scooter has a speed of 9m/s. He is about to go down an inclined road of inclination 30°. He switches off his engine before going down. The incline has a length of 10m and coefficient of friction (3^0.5)/5. While just entering the incline, he sees another car with some speed 'v', engine switched off, about to go down a Similar incline. The road after the incline is frictionless. The scooter guy, after traveling 11m after the incline, hears a thud indicating the car is at the end of the incline. Using the data, findthe carscar's initial speed 'v'.
The answer is 3.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
First calculate the time taken by scooter guy to reach the bottom of incline. That will come as 1 sec. Next find the scooter guy's speed at the end of incline, that will come as 11m/s. Hence time taken for car to come down = (1 + (11/11)) = 2 sec. Now using 10=2v+4,find v, which is 3m/s.