Year: 2014
Topic: Laws of motion
Time :
1. A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a?
(1). \(\frac{2ma}{g + a}\)
(2). \(\frac{2ma}{g − a}\)
(3). \(\frac{ma}{g + a}\)
(4). \(\frac{ma}{g} − a\)