Sheila C.

The work is 0 when force acts in the perpendicular direction, because F . S cos 90 = 0. But WHY is it so?? What is the reason? Say, for instance a ball is rolling and I put my leg on it to stop it... more

bus starts from rest at point A (figure 1) and accelerates at the rate of 0.8m/s2 until it reaches a speed of 12 m/s. It then proceeds at 12m/s until thebrakes are applied; it comes to rest at... more

Two aircrafts, A and B, are flying at approximately the same altitude. AircraftA is flying west with a velocity VA = 900 km/h, while aircraft B is flying northwith a velocity VB = 600 km/h.... more

You travel a distance of 500 kilometers in 10 hours. What is your average speed in kilometers per hour?