00 kg mass falls vertically onto a massless spring from a height of 1.00 m (above the uncompressed spring). If the mass remains on the spring and it...

A 1.00 kg mass falls vertically onto a massless spring from a height of 1.00 m (above the uncompressed spring). If the mass remains on the spring and it is compressed by x=10.0 cm when the mass momentarily comes to rest, calculate the spring constant (k). The energy stored in the spring is equal to ½kx2 .