physics problem!

The spring constant of a toy dart gun is 4442 N/m. To cock the gun the spring is compressed 1.5 cm. The 8 g dart, fired straight upward, reaches a maximum height of 26 m. The acceleration of gravity is 9.81 Determine the magnitude of the energy dissipated by air friction during the dart's ascent. Answer in units of J.

What is the maximum speed the projectile could have when it returns to its starting point? Assume the difference in the frictional energy loss due to the dimished velocity on
the way down compared to its velocity on the way up is negligible. Answer in units of m/s

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asked by kitt

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