(a)[2]
Find the balloon's radius after $30$ seconds.
(b)[3]
Find the rate at which the radius is increasing after $30$ seconds.
Mathematics 9709 · AS & A Level · Differentiation
Differentiation — practice question
A spherical weather balloon is being inflated by a pump. Its volume is rising at a constant rate of $600\,\text{cm}^3$ per second. At the start of pumping, the balloon was empty.