Inertia makes an object want to travel in a straight line. it takes a force to make it move in a circle.

It is called centripetal force.

Explanation:

When an object moves in a circular path, it experiences a centripetal force which always acts towards the centre of the circular path.

The formula of the centripetal force is given by

where, m is the mass of the object, v be the speed of the object and r be the radius of circular path.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.