CBSE Class 12-science Answered

The gravitational force always acts in the downward direction, towards the centre of the earth, whether you throw the object upwards or downwards.

If you use the sign convention in which you take the upward direction as positive and the downward direction as negative, then all quantities in the downward direction will be negative and in the upward direction will be positive.

Now g = -9.8m/s2 all throughout.

If the body moves upwards v is positive. If the body falls downwards v is negative.

Distance covered when the body moves upwards is positive and distance covered when body falls downwards is negative.