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CBSE Class 11-science Answered

Q.solve question 18
Asked by imabhi264 | 11 Aug, 2017, 10:43: PM
answered-by-expert Expert Answer
The following steps will lead to the answers to the query:
 
1) For the first 40 m: u = 0, g = 9.8 and s = 40 m. So, use v2 = u2 + 2gs to find v. You will get v = 28 m/s
 
2) Use the value of v and the equation v = u + gt to find t1 taken for covering 40 m. You will get t1 = 2.9 s
 
3) Now, for the decelerated journey: you have v = 3 m/s, u = 28 m/s, a = -2 m/s2. Use the equation v2 = u2 -2as to find s. You will get 194 m.
 
4) Calculate total distance of aeroplane as 40 + 194 = 234 m
 
5) Use v = u - gt to find t2. You will get t2 = 12.5 s.
 
6) Find total time as t = t1 + t2 = 15.4 s.
Answered by Romal Bhansali | 13 Aug, 2017, 11:05: AM

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