Question

a lift starts from rest its acceleration is plotted against time when it comes to rest its height above its starting point is

Answer 1

Answer:

At, t=4s, a=2  

    u=at=8m/s  

    s1=1/2 a(t) 2

      =1/2×2×(4)2

      =16m  

From 4s to 8s  

a=0, v=constant=8m/s,

 Therefore,

s2=vt

   =(8)(4)=32m

From 8s to 12s  

s3=s1=16m

Therefore,

Total=s1+s2+s3=64m