Question

Answer this Question which image is inserted below Q no 5& 6 both? Answer Quickly.

Answer 1

!! Hey Mate !!

your answer is ----


5) Since, A stone is dropped from the roof a building takes 4z to reach the ground.

such that , t = 4s and initial velocity u=0

stone is attract by gravity so there is acceleration generate in stone by gravity and we know that acceleration due to gravity g = 9.8m/s^2

clearly , height of building is equal to the distance covered by stone

Therefore , by formula

✔ s = ut + 1/2 gt^2

=> h = 1/2 × 9.8 × 4×4

=> h = 78.4 m

hence, option (d) is right

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6) Let , the age of mother be x and age of person be y .

since, A person's present age is 2/5 of the age of his mother

so, y = 2/5 x .....(1)

Now, after 8 year

age of person = y+8
age of mother = x+8

since, after 8 year , he will be 1/2 of the age of his mother

so, (y+8) = 1/2 (x+8)

=> 2/5 x + 8 = 1/2 (x+8) [ from 1 ]

=> 2/5 x + 8 = 1/2 x + 4

=> 2/5 x - 1/2 x = 4 - 8

=> - (x/10) = - 4

=> x = 4×10

=> x = 40


Hence, present age of mother is 40year

Option (c) is right

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