Mountain roads rarely go straight up the slope but wind up gradually, why ?

A motor car needs an engine of 3000 watts to keep up moving with a constant velocity of 10m// s on horizontal road. The force of friction between the car tyres and the ground is

Using an example , explain why some traits are more likely to show up in a men than in women?

What is the weight of an astronaut while going up in a rocket with an acceleration 6 g if he actually weighs 75 kg, when stationary on the surface of the earth ? What is his apparent weight if the rocket falls down freely towards the earth ?

A jeep moving at a speed of 50 km/hr reaches the foot of smooth incline where its engine is switched off. How much distance does the jeep go up the incline before coming to rest ? The inclination of the plane to the horizontal is 45^@ and the acceleration due to gravity at the place is 9.8m/s^2