a girl on a motorbike passes by at a speed of 15 m/sec.her mass is 40 kg. what is the kinetic energy

Kinetic Energy = (1/2) M V^2

The answer will be in Joules.

This is a formula you should memorize.

To calculate the kinetic energy of the girl on the motorbike, you can use the formula:

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.

To calculate the kinetic energy of an object, you need to know its mass and speed. The formula for kinetic energy is:

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.