Answer:
Average speed of the swimmer is 4.44 m/s
Explanation:
As we know that the speed is the ratio of distance covered over time interval
so here we can say

so we know that

time taken to complete the trip is

now we have


Answer: the object transferred some of its energy to its surroundings.
Explanation:
F= ma
F= (600/-10) -10
F= 580n
At least I think that’s the answer
Answer:
2.5 cm
40 D
Explanation:
When the radius of curvature of a lens is divided by 2 we get the focal length of the lens.
Focal length is given by

The focal length of the lens is 2.5 cm
When we divide 1 by the focal length in the unit of meters we get the power of a lens
Power of a lens is given by

The power of the lens is 40 D
The speed of the plane through the air is 430 mph, and you described a day when the wind was blowing at 20 mph.