A 2 kg body undergoes simple harmonic motion of amplitude
10 cm. At this displacement of 10 cm, the restoring force is 20
N. Find the period.

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.