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From-a-tower-of-height-H-a-particle-is-thrown-vertically-upward-with-speed-u-The-time-taken-by-the-particle-to-hit-the-ground-is-n-times-that-taken-by-it-to-reach-the-highest-point-of-its-path-Th




Question Number 18140 by Tinkutara last updated on 15/Jul/17
From a tower of height H, a particle is  thrown vertically upward with speed  u. The time taken by the particle, to  hit the ground, is n times that taken by  it to reach the highest point of its path.  The relation between H, u and n is  (1) 2gH = n^2 u^2   (2) gH = (n − 2)^2 u^2   (3) 2gH = nu^2 (n − 2)  (4) gH = (n − 2)u^2
FromatowerofheightH,aparticleisthrownverticallyupwardwithspeedu.Thetimetakenbytheparticle,tohittheground,isntimesthattakenbyittoreachthehighestpointofitspath.TherelationbetweenH,uandnis(1)2gH=n2u2(2)gH=(n2)2u2(3)2gH=nu2(n2)(4)gH=(n2)u2
Answered by ajfour last updated on 15/Jul/17
−H=u(nt)−(1/2)g(nt)^2     ....(i)  Also    0=u−gt   ⇒   t=u/g  substituting in (i):  −H=((nu^2 )/g)−((n^2 u^2 )/(2g))  or  n^2 u^2 −2nu^2 =2gH  or          2gH=nu^2 (n−2)             [option  (3)]  .
H=u(nt)12g(nt)2.(i)Also0=ugtt=u/gsubstitutingin(i):H=nu2gn2u22gorn2u22nu2=2gHor2gH=nu2(n2)[option(3)].
Commented by Tinkutara last updated on 15/Jul/17
Thanks Sir!
ThanksSir!

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