Answer: Option (b) is the correct answer.
Explanation:
Kinetic energy is the energy of an object or particle when it is in motion.
Mathematically, Kinetic energy = [tex]\frac{1}{2}mass \times (velocity)^{2}[/tex]
It is given that toy truck has mass = 0.75 kg, and velocity = 4 m/s.
Calculate the kinetic energy as follows.
Kinetic energy = [tex]\frac{1}{2}mass \times (velocity)^{2}[/tex]
= [tex]\frac{1}{2}0.75 kg \times (4 m/s)^{2}[/tex]
= [tex]\frac{1}{2}0.75 kg \times 16 m^{2}/s^{2}[/tex]
= [tex]0.75 kg \times 8 m^{2}/s^{2}[/tex]
= [tex]6 kg m^{2}/s^{2}[/tex]
or, Kinetic energy = 6 joules
Thus, we can conclude that kinetic energy of toy truck is 6 J.
