Solve for Height h: Toy Truck of Mass 80g & Speed 4.0m/s

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To determine the height h from which a toy truck of mass 80g must be released to achieve a speed of 4.0m/s at the bottom of a slope, energy conservation is the preferred method. This approach eliminates the need for knowing the slope of the hill, unlike equations of motion, which require that information. The gravitational acceleration of 9.81m/s² is relevant, but the focus should be on equating potential energy at height h to kinetic energy at the bottom. The discussion emphasizes that using energy conservation simplifies the problem significantly. Understanding these principles is crucial for solving the height calculation effectively.
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Hi I am having trouble finding the correct method for tackling this question. Should I be using equations of motion?because then I know that gravity would make it accelerate at 9.81m/s^2 but I am confused... any help would be appreciated.

A toy truck of mass 80g is released from height h and rolls down a slope as shown. What would the height h have to be for the truck to reach a speed of 4.0m/s at the bottom of the slope, assuming friction is negligible.
 

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I would use energy conservation rather than equations of motion. Equations of motion would require that you know the slope of the hill, conservation does not.
 
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