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24. A body is projected with a velocity of 98 ms1. If acceleration due to gravity be 9.8 m/s, then(1) It will go upto the maximum height of 980 m after 10 seconds(2) It will go upto the height of 490 m in 5 seconds(3) It will come back to earth in 10 seconds(4) Its speed reduced to 49 ms- after 5 secondsitThn tima taken by it to fall through suc

Answer»

distance travelled in 10 sec s = ut -1/2gt² s = 98*10-(1/2)*9.8*(10)² = 980- 490 = 490m so , option A and B both are wrong. for option c , after 10 sec the body will be at its peak , and not at earth. this is also wrong.

option D is only correct. v = u-gt or, v = 98 -9.8*5sec v = 98-49 = 49m/s



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