8 A system in simple harmonic motion is described by the equation y (m) = -0.20cos(0.301) Where t Is in seconds. What is the first time after t = 0 s when the mass is at position y = +0.18 m? Select one alternative: 036 s 09.45 0 8.5 s 0 5.0s 090s Reset Maximum marks; 19 Two water waves A and B are produced at the same frequency of 20 Hz and wavelengths of 2 cm and 4 cm respectively. Which following statement is incorrect? Select one alternative: O Wave B travels at 80 cm/'s O Wave A travels at 40 cmi's O Both waves travel at the same speed. O Wave B travels twice as fast as wave A. O Doubling the frequency, halves the wavelength of wave A. Reset Maximum marks: 1T The long pendulum shown is drawn aside until the ball of mass m = 7 kg has risen 0.50 metres above its lowest position. If the ball is released from rest, what is the potential energy of the ball at its lowest position? 0.50m Select one alternative: 0 4.6J Q 34.3 J 0 14.7 J 0 17 2J