A50-kg skateboarder design a creative way to gain enough speed to coast up a ramp. By compressing a stiff spring. H e finds that he can go 1.5 m up the ramp?(adsbygoogle = window.adsbygoogle || []).push({});

A) How much kinetic energy does the spring give him?

B) The energy in the spring can be calculated using the expression 1/2kx^2 where k= 1470N/m and is called the spring constant and x is the distance the spring is compressed. How much was the spring compressed in this case?

My Proof

A)

Eg= mgh

Eg=50kg*9.8N/kg*1.5m

Eg=735J

So Eg=Ek

Ek=735J

B)

735J=1/2*1470N/m*x^2

x^2=1470J/1470N/m

x=1m

Is That right or Wrong?

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# Homework Help: Kinetic Energy and skateboarder

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