Pause the skater's motion at any point other than the very top of the ramp or the very bottom. Take note of the kinetic and potential energy at that point and write the values below. We know the mass and the height at this point, as well. Using the formulas from your formula sheet, calculate the skater's velocity at this point. Show all work below. Mass - 55kg
Height - 5m
Kinetic - 1055.3 J
Potential - 1633.3 J

If football was tossed in air without gravity or friction the ball would go into space

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The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.