A SI unit used to measure force, equal to less than one-quarter of a pound, is the what
1 answer:
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The motion of the stone consists of two separate motions: in air, with average speed 
, and in the water, with average speed 
.
The total distance covered is 127 m, and it is the sum of the distances covered in air and in the water:
(1)
and the total time taken is the sum of the time the stone travels in air + the time the stone travels in the water:
Since
, we can rewrite (1) as
We have now a system of 2 equations with 2 unknown variables:
And if we solve it, we find
Which means that the stone travels for 7 seconds in air and for 5 seconds in the water.
The total distance covered is 127 m, and it is the sum of the distances covered in air and in the water:
and the total time taken is the sum of the time the stone travels in air + the time the stone travels in the water:
Since
We have now a system of 2 equations with 2 unknown variables:
And if we solve it, we find
Which means that the stone travels for 7 seconds in air and for 5 seconds in the water.