Grade 11Mechanics

a stone is dropped from a minar of height h and it reaches after t seconds on earth. from the same minar if two stones are thrown(one upwards and one downwards) with the same elocity u and they reach the earth surface after t1 and t2 seconds respectiely, then

t=t1-t2

t=(t1+t2) /2

t=root of t1t2

t=t1²+t2²

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11 Years agoGrade 11

3 Answers

Nicho priyatham

Approved Tutor Answer11 Years ago

C) t= root t₁t₂

PLZ APPROVE IF CORRECT n exp will b ready

Nicho priyatham

11 Years ago

rember 1 thing

for any such problem in kinamitcs u need to 1^st u first need to wright the equation

s_f=s_i+ut +(1/2)gt²

remember this is a vector equation

so here u have 3 cases

case1(t)

it is clear that t=root 2h/g

now case 2(t₁)

apply the above equation

take ground as orisin

so s_f=0 s_i=h u=u a=-g

so 0=h+ut₁+(1/2)gt₁² ______________________(1)

now case 3(t₂)

appling the same equation

so s_f=0 s_i=h u=-u a=-g

so 0=h-ut₂_-(1/2)gt₂² ______________________(2)

now to eliminate u

multiply t2 with eq1 and add with t1 multiplied with eq2

t2(eq 1) + t₁(eq2)

and take ( t1 +t2) common and solve to get the answer

PLZ APPROVE IF useful in case of any doubts ask in ans box

Archita

11 Years ago

thanks

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