There are three solids made up of aluminium,steel,and wood,of the same shape and same volume. Which of them would have the highest inertia?

In which direction do the following forces act when an object is in motion?
$(i)$ Frictional force
$(ii)$ Gravitational force
$(iii)$ Centripetal force

State whether the following statement is true or false:
Impulse represents the rate of change of momentum of a body.

The action-reaction forces:

$A$ bullet of mass $5 \, g$ travelling at a speed of $120 \, m s^{-1}$ penetrates deeply into a fixed target and is brought to rest in $0.01 \, s$. Calculate: $(a)$ the distance of penetration in the target,$(b)$ the average force exerted on the bullet.

In the following table,the mass and speed of two bodies are given. Which body has more momentum? Justify your answer.

Body	Mass $(kg)$	Speed $(m s^{-1})$
$A$	$1$	$10$
$B$	$2$	$9$