A body is executing simple harmonic motion with an angular frequency of 2 rad/sec. The velocity of the body at 20 mm displacement (the amplitude of motion is 60 mm) is (nearly)

A spring-mass system oscillates in a car. If the car accelerates on a horizontal road, the frequency of oscillation will

The free end of a simple pendulum is attached to the ceiling of a box. The box is taken to a height and the pendulum is oscillated. When the bob is at its lowest point, the box is released to fall freely. As seen from the box during this period, the bob will