A 50kg girl is playing soccer. She runs towards the ball at a speed of 7 m/s. How much kinetic energy does she have as she runs
Physics · Middle School · Thu Jan 21 2021
Answered on
Given:
Mass = 50 kg
Velocity = 7 m/s
Determine the kinetic energy of the girl.
Formula for Kinetic Energy:
Ke = ½ mv^2
Ke = kinetic energy
m = mass
v = velocity
Solution:
Substitute the given values of the mass and the velocity to the formula for the kinetic energy.
Ke = ½ mv^2
Ke = ½(50 kg)(7 m/s)^2
Ke = ½(50 kg)(49 m^2/s^2)
Ke = ½ 2450 kg. m^2/s^2
Ke = 1225 kg . m^2/s^2
Ke = 1225 J
Final answer:
Ke = 1225 J
The kinetic energy of the girl is 1225 Joules.