Question

a cart the weight 20 kg is rolling down a hill with a velocity of 4.2m/s. what is the kinetic energy of the cart.​

Answer 1

`176.4J`

Step-by-step explanation:

Formula to find the kinetic energy is,

`E_(k) = (1)/(2) m {v}^(2)`

Let's solve now

`E _(k) = (1)/(2) m {v}^(2) \\ = (1)/(2) * 20kg * 4.2 m {s}^( - 1) * 4.2 {ms}^( - 1) \\ = (352.8)/(2) \\ = 176.4J`

Hope this helps you.

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Answer 2

• Mass=m=20kg
• Velcocity=v=4.2m/s^2

`\\ \sf\longmapsto K.E=(1)/(2)mv^2`

`\\ \sf\longmapsto K.E=(1)/(2)(20)(4.2)^2`

`\\ \sf\longmapsto K.E=10(17.64)`

`\\ \sf\longmapsto K.E=176.4J`