A body is thrown vertically upward with initial speed 20 m/s. The total time of flight (ignoring air resistance, $g = 10$ m/s²) is:

In uniform circular motion, the net work done by the centripetal force over one full revolution is zero.

A stone tied to a 0.5 m string is whirled in a horizontal circle at 10 rev/s. Its centripetal acceleration is:

In uniform circular motion, which quantity stays constant?

Rain falls vertically at 10 m/s. A person walks north at 10 m/s. The umbrella should be tilted at what angle with the vertical?

Two trains approach each other on parallel tracks at 40 km/h and 60 km/h. Their relative speed is: