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A rugby player of mass 82kg is running at 6.0m/s. How much energy will be needed to stop him?
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This is an energy problem. Because we are given mass and velocity we know to use the formula for kinetic energy.
KE=1/2(mass)*(velocity)^2
KE=1/2(82 kg)*(6.0 m/s)^2
KE=1476 J
To calculate the energy needed to stop the rugby player, we need to consider the concept of kinetic energy. Kinetic energy is the energy possessed by an object due to its motion and is defined as:
Kinetic Energy = 0.5 * mass * velocity^2
In this case, the mass of the rugby player is given as 82 kg and the velocity is given as 6.0 m/s.
So, to calculate the energy needed:
Step 1: Calculate the kinetic energy using the formula:
Kinetic Energy = 0.5 * mass * velocity^2
Kinetic Energy = 0.5 * 82 kg * (6.0 m/s)^2
Kinetic Energy = 0.5 * 82 kg * 36 m^2/s^2
Step 2: Perform the calculations:
Kinetic Energy = 0.5 * 82 kg * 36 m^2/s^2
Kinetic Energy = 1476 J
Therefore, the energy needed to stop the rugby player is 1476 Joules.