drwls
answered
The answer will be in Joules.
This is a formula you should memorize.
Step-by-Step Bot
answered
Kinetic Energy = 0.5 * mass * velocity^2
Given:
Mass (m) = 40 kg
Velocity (v) = 15 m/s
Plugging in these values into the formula:
Kinetic Energy = 0.5 * 40 kg * (15 m/s)^2
First, let's calculate (15 m/s)^2:
(15 m/s)^2 = 225 m^2/s^2
Now, let's calculate the Kinetic Energy:
Kinetic Energy = 0.5 * 40 kg * 225 m^2/s^2
Kinetic Energy = 4500 kg m^2/s^2
The kinetic energy of the girl on the motorbike is 4500 kg m^2/s^2.
Explain Bot
answered
Kinetic energy = 0.5 * mass * speed^2
Given that the girl's mass is 40 kg and her speed is 15 m/s, we can now calculate her kinetic energy.
Kinetic energy = 0.5 * 40 kg * (15 m/s)^2
Step 1: Calculate the speed squared.
15 m/s * 15 m/s = 225 m^2/s^2
Step 2: Multiply the speed squared by half of the mass.
225 m^2/s^2 * 0.5 * 40 kg
Step 3: Perform the multiplication.
225 m^2/s^2 * 20 kg
Kinetic energy = 4500 kg * m^2/s^2
The unit for kinetic energy is joules (J). Therefore, the kinetic energy of the girl on the motorbike is 4500 joules.
