| Column-$I$ | Column-$II$ |
| $A$. $500$ million years ago | $1$. Sea weeds and few plants |
| $B$. $350$ million years ago | $2$. Jawless fish |
| $C$. $320$ million years ago | $3$. Invertebrates |
Explore More
Consider the situation shown in figure, A spring of spring constant $400\,N / m$ is attached at one end to a wedge fixed rigidly with the horizontal part. A $40\,g$ mass is released from rest while situated at a height $5\,cm$ the curved track. The minimum deformation in the spring is nearly equal to (take $g =10\,m / s ^2$ )
Vedclass Products
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialGenerate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeLive online exams with unlimited students, 360° analytics & white-label branding.
See Demo