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A body travels 200cm in first …

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A body travels 200cm in first 2 seconds and 220 cm in next 5 seconds. calculate the velocity at the end of 7th second from the start.

Posted by Gautam Kumar 4 years, 4 months ago

CBSE > Class 09 > Science

3 answers

Yogita Ingle 4 years, 4 months ago

let initial velocity = u & accleration is a then

distance travelled in 4 sec = S6

using , s = ut + at²/2

S6 = 4u + a36/2

= 6u+18a

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

=2u+2a = 200 (given)

u+a = 100 ........................1

now distance covered in 2 to 6 sec is given 220cm

S6-200 = 220

6u + 18a = 420

u+3a = 70 .................2

from 1& 2

a = -15 & u=115

velocity after 7 sec = V7

V₇ = u + at

=115 - 15*7=10cm/sec

Gautam Kumar 4 years, 4 months ago

Please solve in detail?

Patel Kamlesh 4 years, 4 months ago

440 cm

ANSWER

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