0.50 kg cream pie strikes a circus clown in the face at a speed of 5.00 m/s and stops. What is the change in kinetic energy of the pie?
in joules
(1/2) m v^2
thts the formula for how to find kinetic energy not how to calculate the change in kin. energy. what is the formula for change?
It stopped, therefore the final Ke is zero so the change is -(1/2)mv^2
To find the change in kinetic energy of the cream pie, we need to first calculate the initial kinetic energy and the final kinetic energy, and then find the difference between them.
The formula for kinetic energy is given by: KE = (1/2) * m * v^2
Where:
KE is the kinetic energy
m is the mass of the object
v is the velocity of the object
Let's calculate the initial and final kinetic energies separately.
Initial kinetic energy:
Given that the mass of the cream pie is 0.50 kg and the initial velocity is 5.00 m/s, we can substitute these values into the formula:
KE_initial = (1/2) * m * v_initial^2 = (1/2) * 0.50 kg * (5.00 m/s)^2
Final kinetic energy:
Since the pie stops, its final velocity is 0 m/s.
KE_final = (1/2) * m * v_final^2 = (1/2) * 0.50 kg * (0 m/s)^2
Now, let's calculate the initial and final kinetic energies:
KE_initial = (1/2) * 0.50 kg * (5.00 m/s)^2 = 0.50 * 12.50 = 6.25 Joules
KE_final = (1/2) * 0.50 kg * (0 m/s)^2 = 0 Joules
To find the change in kinetic energy, we subtract the final kinetic energy from the initial kinetic energy:
Change in kinetic energy = KE_final - KE_initial = 0 Joules - 6.25 Joules
Therefore, the change in kinetic energy of the cream pie is -6.25 Joules.