The circuit of a motor racing tracks 3 km in length. In a race, a car goes 25 times round the circuit in 30 minutes.
What is the average speed of the car?
A 75 km/hour
B 90km/hour
C 150km/hour
D 750 km/hour

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

The force it would take to accelerate an 900-kg car at the rate of 6m/s2