A horizontal plank has a rectangular block placed on it. The plank starts oscillating vertically and simple harmonically with an amplitude of 40 cm. The block just loses contact with the plank when the later is at momentary rest. Then:
Why this question? Tip: The body looses contact with the surface on which it is palced at the instant the acceleration of 2 differs! We can equate the two in limiting case. Caution: Weight in a frame is equal to normal reaction! |