(b) A metal block A, travelling in a straight line at 4.0 m/s on a smooth surface, collides with a second metal block B which is at rest. Fig. 3.1 shows the two metal blocks A and B before and after the
collision.
1.6 kg
3.2 kg
4.0 m/s
А
at rest
before collision
B.
1.5 m/s
V
А
B.
after collision
Fig. 3.1
The mass of A is 3.2 kg. The mass of B is 1.6 kg.
After the collision, the velocity of A is 1.5 m/s.
Calculate
(i) the momentum of A before the collision,
momentum =
(ii) the velocity v of B after the collision
V=
(c) In the collision that occurred in (b), block A and block B are in contact for 0.050 s.
Calculate the average force that is exerted on B during the collision.
average force =
(d) After the collision in (b), the total kinetic energy of the two blocks is less than the kinetic
energy of block A before the collision
Suggest one reason for this.

    m₁v₁ + m₂v₂ = (m₁ + m₂)vmomentum is conserved.the left-hand side of the equation represents the momentum in the system before the collision.the right-hand side represents the momentum in the system after the collisionm₁ and v₁ represents the mass and the velocity of the physics blockm₂ and v₂ represents the mass and velocity of the ball of puttyv represents the final velocity of the combined mass.the question states the two masses stick together. they combined mass has its own velocity with the body mass the sum of the two objects' massestheir combined momentum is (m₁ + m₂)vto find the magitude of (m₁ + m₂)v, we need to add the vectors on the left-hand side of the equation: m₁v₁ + m₂v₂.note the diagram. i have positioned the vectors in accordance with their directions.the magnitude of the resultant can be calculated using the pythagorean theorem since this is a right triangle situation (north and west are perpendicular)|(m₁ + m₂)v| =  √[ (m₁v₁)² + (m₂v₂)² ]|(m₁ + m₂)v| =  √[ (1.5kg·8.0m/s)² + (0.40kg·20m/s)² ]|(m₁ + m₂)v| =  14.4 kg m/sfor two significant figures (assuming that 20m/s is two), this rounds to 14 kg m/s

The answer is d, you can easily test a theory! hope i you : )

Mass / weighthope it !