During a tennis match, a player serves the ball at 25.7 m/s, with the center of the ball leaving the racquet horizontally 2.37 m above the court surface. The net is 12 m away and 0.90 m high. When the ball reaches the net, what is the distance between the center of the ball and the top of the net?

Two blocks with masses M and m are pushed along a horizontal frictionless surface by a horizontal applied force F acting on the mass M. The magnitude of the force of m on M is:

A car, when going with a speed of V and rounding an unbanked curve with a radius R, is just on the verge of slipping. If its speed is now doubled, what  is the radius of the tightest unbanked curve that it can drive around without skidding? 

An elevator cab with mass 1200 kg moves downward. What is the tension in the cable if the cab’s speed is decreasing at a rate 2.2 m/s2?

A physics textbook is placed on a spring scale in an elevator. Of the following, the scale shows the highest reading when the elevator:

A boy pulls a box along a rough horizontal floor at constant speed by means of a force of magnitude F which is directed at an angle

A car is moving along a straight line with a velocity v. Applying the brake causes a constant negative acceleration which stops it in 5 s within a distance 75 m. What is the magnitude of the acceleration in m/s2?

A football is kicked with a velocity v0-at an angle

A block of mass m is pulled along a horizontal (frictionless) floor by an applied force F as shown at an angle

A block is moving at a constant speed of +2 m/s in the positive x-direction, and has three forces acting on it, F1, F2 and F3. F1 = +6 N, F2 = -2 N (the + and – signs refer to the positive and negative x-directions respectively throughout the question). What is F3?