Assume that the earth goes round the sun in a circular orbit with a constant speed of 30 km/s
A. The averge velocityof the earth from, 1st Jan, 90 to 30th June, 90 is zero
B. The averge acceleration during the above period is `60 km/s^2`
C. The average speed from 1st Jan, 90 to 31st Dec, 90 is zero
D. The instantaneous acceleration of the earth ponts towards the sun.
