Question

What is the kinetic energy of an

object of mass 1.5kg travelling at 3m/s? Give your answer to 2 decimal places.

Answer 1

K.E = 1/2mv²

= 1/2 × 1.5 × 3 ×3

= 6.75 J

Answer 2

the kinetic energy of the object is approximately 1.35 joules.

Step-by-step explanation:

To calculate the kinetic energy (KE) of an object, you can use the following formula:

KE = (1/2) * mass * velocity^2

Where:

KE is the kinetic energy

mass is the mass of the object (in kilograms)

velocity is the velocity of the object (in meters per second)

In this case, you have:

Mass (m) = 1.5 kg

Velocity (v) = 3 m/s

Plug these values into the formula:

KE = (1/2) * 1.5 kg * (3 m/s)^2

Now, calculate:

KE = (1/2) * 1.5 kg * 9 m^2/s^2

KE = 0.5 * 1.5 kg * 9 m^2/s^2

KE = 1.35 kg m^2/s^2

Now, let's express the units in terms of joules (J), which is the standard unit for energy:

1 J = 1 kg m^2/s^2

So, the kinetic energy is:

KE = 1.35 J

Rounded to two decimal places, the kinetic energy of the object is approximately 1.35 joules.