A rock is dropped from a vertical cliff. The rock takes 3.00 s to reach the ground below the cliff. A second rock is thrown vertically from the cliff. It takes 2.00 s to reach the ground below the cliff from the time it is released. With what velocity was the second rock released?
A) 4.76 m/s upward
B) 5.51 m/s downward
C) 12.3 m/s upward
D) 4.76 m/s downward
E) 12.3 m/s downward
E
You might also like to view...
Inside your apartment, you blow up a balloon as large as possible and then take it outside on a hot summer day. The balloon is most likely to then
A. shrink. B. remain the same size. C. expand and pop.
An expandable container holds 2.30 mole of He gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa. How much heat is gained by the gas in this process?
A) 1280 J B) 792 J C) 685 J D) 1370 J E) 1700 J
The Moon rises later each day because ________.
A. the Moon follows an elliptical orbit around Earth B. Earth moves approximately one degree per day in its orbit around the Sun C. the Moon moves in its orbit faster than Earth rotates D. the Moon shifts eastward relative to the stars in its orbit around Earth E. None of these choices is correct.
Mercury is visible to us:
A. only in the summer. B. only in the winter. C. only very briefly near sunrise or sunset. D. only during its new phase. E. only during the several hours around midnight