Question

A body initially at rest is moving with uniform acceleration a. Its velocity after n seconds is v. The displacement of the body in last 2 seconds is_____

Answer 1

u=0,a (uniform acceleration),t=n

v (final velocity after n seconds)

v=0+an⟹v=an⟶(1)

sn (distance travelled in n seconds)=0+21an2

sn−2=21a(n−2)2

Distance travelled in least 2 seconds       =sn−sn−2=21a[n2−(n−2)2]=21a[n2−n2−4+4x]=2an−2a⟶(2)

From equation 1 and 2,

x=2a(n−1)x=u2v(n−1)

Answer 2

Explanation:

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