A 63.0 kg person, standing on a divingboard, dives straight down into the water.

Question

A 63.0 kg person, standing on a divingboard, dives straight down into the water. Just before striking thewater, her speed is 6.50 m/s. At a time of1.70 s after she enters the water, herspeed is reduced to 1.00 m/s. What is thenet average force (magnitude and direction) that acts on her whenshe is in the water? magnitude 1 N direction 2---Select---downwardupwardnot enough information to tellperpendicular to the person magnitude 1 N direction 2---Select---downwardupwardnot enough information to tellperpendicular to the person

Explanation / Answer

mass m = 63 kg initial speed u = 6.5 m / s time t = 1.7 s final speed v = 1 m / s Net average force   F = m ( u - v ) / t                                 = 203.82 N direction is opposite to the direction of motion .i.e.upward

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