QI Figure Q1 shows a canon firing a shell at 50° from the slope, from a height of 200m. It was observed that the shell remained in the air for 4 seconds. (a) Determine the velocity, Va at which the shell was fired. (b) Determine the horizontal distance between A and C. (c) Determine the maximum height the shell attains from the sea level. Neglect the size of the shell. Use g = 9.81m/s2 Hints: The verticle displacement is the difference in elevation of A and C. Va: 50° 200 m Sea level 40° 150m FIGURE Q1

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.