Question

A car has a kinetic energy of 4.32 x 10J when traveling at a speed of 23 m/s. What is its mass?

Answer 1

0.163 kg

Step-by-step explanation:

`\sf Kinetic \ Energy = (1)/(2) \ x \ mass \ x \ velocity^2`

Here we are provided with:

1) Kinetic Energy = 4.32 x 10 Joules ≈ 43.2 Joules

2) Speed/Velocity = 23 m/s

Now, solve for mass:

`\rightarrow \sf (1)/(2) \ x \ mass \ x \ velocity^2 = Kinetic \ Energy`

`\rightarrow \sf (1)/(2) \ x \ mass \ x \ (23)^2 =43.2`

`\rightarrow \sf mass= (43.2 (2))/(23^2)`

`\rightarrow \sf mass= 0.163 \ kg`