Question

A body travelling with uniform acceleration covers a distance of 28m in the 5th second and 32m in the 7th second. Find the initial velocity of body inms−1?​

Answer 1

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11th

Physics

Motion in a Straight Line

Uniformly Accelerated Motion

A body moving with uniform ...

PHYSICS

Asked on December 30, 2019 byWaheeda Malviya

A body moving with uniform acceleration travels a distance sn= (0.4n + 9.8) m in nth second. Initial velocity of the body is (in ms−1)

A

0.4

B

10

C

3.5

D

4

MEDIUM

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ANSWER

sn distance travelled in n sec-distance travelled in (n-1) sec

sn=(u1n+21an2)−(u1(n−1)+21a(n−1)2)

     =u1+21a(n2−(n−1)2)

     =u1+2a(+2n−1)=u1+an−

=u1=10 m/sec

may it help you mate