Question

The string of a simple pendulum is held in horizontal position and the bob is released. Find the acceleration of the bob when the string makes an angle theta with downward vertical.
How to solve this?​

Answer 1

Cos
−1
(
3
​

1
​
)
At angle theta , l = length of rod v = pendulum velocity u = vertical velocity
By energy conservation,
mglcosθ=
2
mv
2

​
=
2sin
2
θ
mu
2

​

Differentiating wrt θ , and putting
dθ
du
​
=0;
we get, θ=cos
−1
(
3
​

1
​
)

Answer 2

Answer:

i just solved

Explanation:

so easy explkainable