Using a for airtime and w for water time ,which system of linear equations would you use to solve this problem?
A stone falls from the top of a cliff into the ocean .
In the air , it had an average speed of 16m/s .In the water ,it had an average speed of 3m/s before hitting the seabed. The total distance from the top of the cliff to the seabed is 127 meters ,and the stone's entire fall took 12 seconds .
How long did the stone fall in air ,and how long did it fall in the water ?
A) a + w = 127 ; 16a +3w = 12
B) a +w =12 ; 16a +3w = 127
C) a- w = 12 ; 16a - 3w =12
1 answer
hint: a and w are times, and add to 12.
1 answer