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'.