Question

The mass of the bob of a simple pendulum of length L is m . If the bob is left from its horizontal position then the speed of the bob and the tension in the thread in the lowest position of the bob will be respectively.

(a) √2gL and 3mg

(b) 3mg and √2gL

(c) 2mg and √2gl 

(d) 2gl and 3mg

Answer 1

Correct Option (a) √2gL and 3mg 

Explanation:

By the conservation of energy 

Potential energy at point A = Kinetic energy at point B