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a. 1/2 ka cos 2 t
2
b. 1/2 k a cos 2 t
2
2
c. 1/2 kacos 2 t

d. ka cos 2 t
2
6.
A body of mass 5 gm is executing simple harmonic motion about a point O with
amplitude of 10 cm. Its maximum velocity is 100 cm/sec. Its velocity will be 50
cm/sec at a distance (in cm)
a. 5.

b. 5

c.

d. 10

7.
A simple pendulum performs simple harmonic motion about X=0 with an
amplitude A and time period T. The speed of the pendulum at X = A/2 will be

a.

b.

c.

d.

8.
Starting from the origin, a body oscillates simple harmonically with a period of 2s.
Its kinetic energy becomes 75% of the original energy after

a. (1/12) s.
b. (1/6) s.

c. (1/4) s.

d. (1/3) s.

9.
The equation of motion of an object is x = 2.0 cos (0.50t+ /4) meters. Its
maximum acceleration is

a. 0.05 ms .
-2
b. 0.50 ms .
-2
c. 2.0 ms .
-2

d. 2.25 ms .
-2