A 8.2 m long elastic band is used to launch a toy glider. Once stretched to a length of 38 m, the band releases 1.6 J of elastic potential energy when you let it contract 0.051 m. What forward force is the band exerting on the toy glider?
k=2*1.6J/29.8^2=3.6034 x 10^-3
3.6 x 10^-3N/m * 0.051=1.84x10^-4
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