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Send 3 a body travel 220 in 1st to 2nd and the 220 CM in at 5:13 calculate the velocity at the end of 7 seconds from the start please solve questions of motion class 9

Send 3 a body travel 220 in 1st to 2nd and the 220 CM in at 5:13 calculate the velocity at the end of 7 seconds from the start please solve questions of motion class 9

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1 Answers

Arun
25763 Points
3 years ago

let initial velocity = u & accleration is a then

distance travelled in 5 sec = S7

using , s=ut + at2/2

S7 = 5u + a49/2

=  (10u+49a) / 2

distance covered in 2 sec = S2 = 2u + 4a/2

=2u+2a = 200 (given)

u+a = 100    .....1

now distance covered in 2 to 7 sec is given 220cm

S7-200 = 220

(10u+49a) / 2 = 420       

10 u+ 49 a = 840    ........2

from 1& 2

find a and u then you will be able to solve velocity after 7th second

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