2. A student in determined to test the law gravity for himself by walking off as skyscraper 900 f high, with a stopwatch on hand, and starts his free fall (zero initial velocity). Five seconds later, superman arrives at the scene and dives of the roof to save the student. What must superman's initial velocity be in order that he catches the student just before the ground is reached? A. 315 ft/sec B. 300 ft/sec C. 320 ft/sec D. 350 ft/sec
The resultant of the four forces is 1000 lbs in the direction 30 degree west of north. Three of the forces are 500 lbs, 60 degrees north of east; 300 lbs south and 400 lbs 53 degree west of south. Find the rectangular components of the fourth force..
A. Fx = - 320 lbs, Fy = - 240Ibs
B. Fx=-500lbs, Fy=866lbs
C. Fx = - 250 lbs, Fy 433 lbs
D. Fx = - 430 lbs, Fy = 973 lbs
2. A student in determined to test the law gravity for himself by walking off as skyscraper 900 f high, with a stopwatch on hand, and starts his free fall (zero initial velocity). Five seconds later, superman arrives at the scene and dives of the roof to save the student. What must superman's initial velocity be in order that he catches the student just before the ground is reached?
A. 315 ft/sec
B. 300 ft/sec
C. 320 ft/sec
D. 350 ft/sec
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