1) Let the acceleration is a m/s^2 and the velocity after 4 sec is v m/s <span>=>By v = u + at </span> <span>=>v = 4a ------------(i) </span> <span>For 1st phase:- </span> <span>=>By s = ut + 1/2at^2 </span> <span>=>s1 = 0 + 1/2 x a (4)^2 </span> <span>=>s1 = 8a --------------(ii) </span> <span>For 2nd phase:- </span> <span>=>By s = vt </span> <span>=>s2 = 4a x (9.1-4) </span> <span>=>s2 = 20.4a -------------(iii) </span> <span>=>By (ii) + (iii):- </span> <span>=>s1+s2 = 8a + 20.4a </span> <span>=>100 = 28.4a </span> <span>=>a = 3.52 m/s^2 </span> <span>2)(a) By v = u -gt </span> <span>=>0 = u - 9.8 x 1.5 </span> <span>=>u = 14.7 m/s </span> <span>(b) By v^2 = u^2 - 2gh </span> <span>=>0 = (14.7)^2 - 2 x 9.8 x h </span> <span>=>h = 11.03 m </span> Thank you for posting your question here.
See projectiles are very simple unless you understand its core concepts....projectile is nothing just mixture of upward motion and horizontal motion.... THE KEY IS FORGET THE NAME PROJECTILE...ITS JUST HORIZONTAL MOTION + VERTICAL MOTION
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