Please Help! Physic question

Physics
Tutor: None Selected Time limit: 1 Day

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?

May 4th, 2015

Elastic extension=38m-8.2=29.8m

k=2*1.6J/29.8^2=3.6034 x 10^-3

F=kx

3.6 x 10^-3N/m * 0.051=1.84x10^-4

F=1.84x10^-4 N

May 4th, 2015

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