Convert the following 1 mi = 1609 m 1 ft = 12 in 1 in = 2.54 cm 1 hr = 60 min 1 min = 60 sec

1) 3900 m = ? mi

2) 40 cm = ? ft

3) 20 mi/hr = ? m/s

4) $15/hr = ? ¢/s

5) 2000 m/year = ? mi/week
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Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field