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15. A body of mass 500 g, initially at rest, is actedupon by a force which causes it to move adistance of 4 m in 2 s. Calculate the forceapplied.Ans. IN |
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Answer» A body of mass 500g or 0.5 kg , initially at rest is acted upon by force which causes it to move a distance 4m in 2sec. here, initial velocity , u = 0time taken , t = 2 sec distance covered , s = 4m use formula , S = ut + 1/2 at² 4 = 0 + 1/2 × a × 2² 4 = 2a => a = 2 m/s² we know, from Newton's 2nd law of motion, F = ma here, m = 0.5kg and a = 2m/s² so, F = 0.5 × 2 = 1N hence, force applied 1N a= 2F= 1N is the correct answer of the given question |
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