A pendulum bob of mass 50 gm is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately
A) 0.30 N
B) 0.40 N
C) 0.42 N
D) 0.50 N
Correct Answer:
D
Solution :
: \[T=M(g+a)\] Since acceleration\[a=0,\] \[T=Mg=\frac{50}{1000}\times 10=0.50N\].