A car moving at speed 50 km/h one applying brake stops at a distance of 6m. If same car move with the velocity 100 km/h, what distance it cover after applying the brakes.

1) 12 m

2) 18 m

3) 24 m

4) 6 m  

It takes a minimum distance of 48.96 m to stop a car moving at 12.0 m/s by applying the brakes (without locking the wheels). Assuming that the same frictional forces apply, find the minimum stopping distance when the car is moving at 26.0 m/s.

The brakes of a truck cause it to slow down by applying a retardingforce of 2.60 103 N to the truck over a distance of 780 m. What isthe magnitude of the work done by this force on the truck?
1 J

Is the work positive or negative?
2

Why?

The driver of a car on a horizontal road makes an emergency stop by applying the brakes so that all four wheels lock and skid along the road. The coefficient of kinetic friction between tires and road is 0.40. The separation between the front and rear axles is L = 4.2 m, and the centre of mass of the car is located at distance d =1.8 m behind the front axle and distance h = 0.75 m above the road. The car weighs 11 kN. Find the magnitude of the braking acceleration of the car.