Question

From a tower of height H a particle is thrown vertically upwards with a 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

(a) 2gH  = n² u²

(b) gH =(n-2)² u²

(c) 2gH = nu² (n-2)

(d) gH = (n-2)² u²

Answer 1

Correct option  (c) 2gH = nu² (n-2)
Explanation :

Time taken to reach the maximum height

t₁ = u / g

If t₂  is the time taken to nit ground

Comments

How t1=u/g

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how t =u/g

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i got it because final velocity is zero so