138k views
15 votes
A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 77.0-kg water-skier has an initial speed of 6.3 m/s. Later, the speed increases to 10.9 m/s. Determine the work done by the net external force acting on the skier.

User Rob L
by
7.4k points

1 Answer

7 votes

Answer:

the work done by the net external force acting on the skier is 3046.12 J.

Step-by-step explanation:

Given;

initial speed of the water skier, u = 6.3 m/s

final speed of the water skier, v = 10.9 m/s

mass of the water skier, m = 77 kg

The work done by the net external force is calculated as;

W = ΔK.E


W = (1)/(2) m(v^2 - u^2)\\\\W = (1)/(2) * \ 77.0(10.9^2 - 6.3^2)\\\\ W= 3046.12 \ J

Therefore, the work done by the net external force acting on the skier is 3046.12 J.

User Analog File
by
8.5k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.