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`        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`
5 years ago

Nicho priyatham
625 Points
```							C) t= root t1t2PLZ APPROVE IF CORRECT n exp will b ready
```
5 years ago
Nicho priyatham
625 Points
```							rember 1 thing for any such  problem in kinamitcs u need to 1st u first need to wright the equation sf=si+ut +(1/2)gt2remember this is a vector equationso 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 sf=0 si=h   u=u a=-g     so   0=h+ut1+(1/2)gt12  ______________________(1)	now case 3(t2)            appling the  same equation          so sf=0 si=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
```
5 years ago
Archita
132 Points
```							thanks
```
5 years ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions