IX. A pendulum is formed by tying a massless string of 1m in length to a bob of mass M. The pendulum is raised and positioned at a horizontal position. The bob is then released from rest (see figure). What is its speed when it is at the lowest point?

A. 0 m/s

B. 3.13 m/s

C. 4.43 m/s

D. 19.6 m/s

E. 9.8 m/s

Ans. C
 

X. A pendulum is formed by tying a massless string of 0.5 m in length to a 0.5 kg bob. The pendulum is set at a swinging motion. When the bob is at the lowest point, it is traveling with a speed of 3 m/s. What is the tension in the string?

A. 0N

B. 4.9N

C. 9N

D. 4.1N

E. 13.9N

Ans. E