Question

An object of mass 1.50 x 10^2 g is accelerated to a speed of 39 m/s. What is the kinetic energy of this object in joules? a) Find the kinetic energy using the formula KE = 1/2mv^2. b) Express the kinetic energy in scientific notation. c) Determine the work done on the object. d) Calculate the potential energy at this speed.

Answer 1

The kinetic energy of the object is approximately 1140 joules.

Step-by-step explanation:

To find the kinetic energy of an object, we can use the formula KE = 1/2mv^2. First, we need to convert the mass of the object from grams to kilograms by dividing it by 1000. So, the mass of the object is 1.50 x 10^2 g / 1000 = 1.50 kg. Then, we can use the formula to calculate the kinetic energy:

KE = 1/2 * 1.50 kg * (39 m/s)^2 = 1/2 * 1.50 kg * 1521 m^2/s^2 ≈ 1140 J

So, the kinetic energy of the object is approximately 1140 joules.