SOLVE URGENTLY PLS 1. A 4 kg mass attached to a spring is observed to oscillate with a period of 2 seconds what is the period of oscillation if a 6kg mass is attached to the spring? 2. A particle undergoes simple harmonic motion of amplitude 30 cm and frequency 0.5hz. Calculate the following A.velocity when the statement is 18 cm B. the maximum velocity C. acceleration when the displacement is 13.5 cm. 3. A simple pendulum of length 0.4m has a period of 2 seconds what is the period of a simple pendulum of length 0.8 at the same place.​