Give the thoughts of Rushi and Scientist Aryabhatta on the planetary motion.

Describe Ptolemy model for planetary motion.

Give the contribution of Tycho Brahe on planetary motion.

Describe Nicholas Copernicus model for planetary motion.

Briefly give the contributions of the following scientists in formulating the cell theory (a) Rudolf Virchow (b) Schleiden and Schwann

Figure gives a speed - time graph of a particle in motion along a constant direction. Three equal intervals of time are shown. In which interval is the average acceleration greatest in magnitude ? In which interval is the average speed greatest? Choosing the positive direction as the constant direction of motion give the signs of vand a in the three intervals. What are the acclerations at the points A, B, C and D?

Write the Kepler law of period (Kepler's third law) for planetary motion.

Give some examples of motion.

Figure gives the x-t plot of a particle is one dimensional motion. Give the signs of position, velocity and acceleration of the particle at t = 0.3s