1. A pendulum whose length is Im oscillation 30 times per minutes in
   particular location. What is the acceleration of the gravity there? (2 points)
   3. When 25grames mass is attached to one end
   of a spring of spring constant
   400N/m. if the object is undergoing
   periodic motion on smooth horizontal
   surface what is period of oscillation? (1
   point)
   4. A force of 20N causes a spring to extend by 40mm. Find a spring constant of
   the spring in N/m. (1 point)
   5. In a test to measure the depth of Lake Langano a student on the boat send
   ultrasonic pulse. The pulse took 0.2second to travel from the boat to the bed
   of the lake and back to the boat. What is the depth of Lamgano as measured
   by the student? Take the speed of sound in the Lake 340m/s. (1 point)
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