A 66.0 kg person, standing on a diving board, dives straight down into the water

Question

A 66.0 kg person, standing on a diving board, dives straight down into the water. Just before striking the water, her speed is 5.40 m/s. At a time of 1.55 s after she enters the water, her speed is reduced to 1.10 m/s.
What is the net average force (magnitude and direction) that acts on her when she is in the water? _______N
The direction:
- upward
-perpendicular to the person
-not enough information to tell
-downward

can someone show me how to solve this problem and give me the correct answers?

Explanation / Answer

the direction of the force is upwards because the resistance to motion is firctional and hence opposing the motion ;

F = change in momentum / time ;

F = m ( v2 - v1 ) / t ;

F = 66 ( -1.1 - ( -5.4 ) ) / 1.55   = 183.096 N    <--ans

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