The table shows the mechanical energy and velocity of a rock that was thrown four times. the rock has a mass of 2.4 kg. during which trial was the rock the highest above the ground? 1 2 3 4

Second trial

Explanation:

The table shows the mechanical energy and velocity of a rock that was thrown four times. The rock has a mass of 2.4 kg.

We have to find during which trial was the rock the highest above the ground.  

We know that mechanical energy is equal to the sum of kinetic energy and potential energy.  

So, PE = ME-KE

PE₁ = 32 - 58.8 = -26.8 J

So, PE = ME-KE

PE₂ = 34 - 4.8 = 29.2 J

So, PE = ME-KE

PE₃ = 35 - 43.2 = -8.2 J

So, PE = ME-KE

PE₄ = 31 - 10.8 = 20.2 J

We know that potential energy is directly proportional to the height from the surface. In second trial, the rock have maximum potential energy.

Hence, in second trial the rock is highest above the ground.

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