Two bodies A and B are moving with equal velocities. The mass of B is doubled that of A. In this context, which one of the following statement is correct?

The SI unit of acceleration is

An object is placed at the centre of curvature of a concave mirror of focal length 16 cm. If the object is shifted by 8 cm towards the focus, then the nature of the image would be

A pencil is placed upright at a distance 10 cm from a convex lens of focal length 15 cm. The nature of the image of the pencil will be