A boy has a mass of 45 kg and is running with a velocity of 8 m/s. Find the boy's kinetic energy.
Kinetic energy:
KE=0.5*m*v^2
(KE=kinetic energy, m=mass, v=velocity ***which happens to be squared!)
Also, units are in joules.
KE= 0.5*m*v^2
=0.5*45*8^2
=1440 J
To find the boy's kinetic energy, you can use the formula:
Kinetic Energy = 1/2 * mass * velocity^2
Given that the boy's mass is 45 kg and velocity is 8 m/s, we can substitute these values into the formula:
Kinetic Energy = 1/2 * 45 kg * (8 m/s)^2
= 1/2 * 45 kg * 64 m^2/s^2
= 1440 kg * m^2/s^2
Therefore, the boy's kinetic energy is 1440 kg * m^2/s^2.
To find the boy's kinetic energy, we can use the formula:
Kinetic Energy = 1/2 * mass * velocity^2
Given that the boy's mass is 45 kg and his velocity is 8 m/s, we can substitute these values into the formula to calculate his kinetic energy. Let's calculate step by step:
1. First, square the velocity:
8^2 = 64
2. Multiply the mass by the squared velocity:
45 * 64 = 2880
3. Finally, multiply the result by 1/2:
1/2 * 2880 = 1440
The boy's kinetic energy is 1440 joules.