A sphere is accelerated upwards by cord whose braking strength is four times its weight. The maximum acceleration with which the sphere can move up with our breaking the cord is
A)g
B)3g
C)2g
D)4g
Correct Answer:
B
Solution :
Here, the tension in the cord is given by \[T=mg+ma\] \[4mg=mg+ma\] \[g=\frac{a}{3}\] \[a=3g\]