20 4 points A weight hooked onto the end of a spring fixed to a ceiling bounces up and down The weight s height h relative to the ground in metres is given by the formula 0 25 sin 240 90 1 5 where is the time in seconds a What is the weight s initial height b How high off the ground is the weight when it is midway between its highest and lowest points c What is the weight s maximum height d What is the height after 2 5 s