2) The 1.5 kg mass shown is placed against a spring compressed by 10.0 cm from its relaxed position. The mass is released and slides along a rough platform that has a surface a coefficient of friction of 0.35. The mass lands with a speed of 12.0 m/s at impact. The spring constant k is 1.50 kN/m. How tall is the platform? x = 10cm 20cm- m = 2.0 kg