Useful Information: g = 9.8 m/s2

1. A car has a uniform acceleration of 12 m/s², to the right. If it has an initial velocity of 20 m/s (also to the right) what is its final velocity after 4 seconds?

2. A hijacker drops an 80 kg chest of gold from an airplane. Neglecting air resistance, how far does the chest fall in 6 seconds?

3. The distance between two objects which exert a gravitational force on each other is doubled. By what factor must one multiply the old gravitational force, (F1) to get the new one (F2) (what is F2/F1?)

4. A water wave has a frequency of 4 cycles/sec and a wavelength of 2 meters. What is the wave velocity?