defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Mathematics Differential Calculus Applications of Derivatives
The surface area of a balloon being inflated changes at constant rate . If initially, its radius was 5 unit and after 3 seconds it is 7 units, find the radius after t seconds,
1
r = \(\rm\sqrt{8t +81}\)
2
r = \(\rm\sqrt{8t +9}\)
3
r = \(\rm\sqrt{8t +25}\)
4
r = \(\rm\sqrt{8t + 5}\)