Which graph(s) could correctly show the energy-momentum 4-vectors for a particle with the worldline shown? Or choose (e) more than one could be correct

1
Which graph(s) could correctly show the
energy-momentum 4-vectors for a particle with the
worldline shown?Or choose (e) more than one
could be correct
2
In a completely inelastic collision, the two
objects stick together afterwards. Consider a
completely inelastic collision between two
identical masses A and B, where B is initially
stationary.The initial velocity of A cannot
exceed c, so the final velocity cannot exceed
c/2.A trueB false
3
In a completely inelastic collision, the two
objects stick together afterwards. Consider a
completely inelastic collision between two
identical masses A and B, where B is initially
stationary.The initial velocity of A cannot
exceed c, so the final velocity cannot exceed
c/2.FALSE.
4
In a completely inelastic collision, the two
objects stick together afterwards. Consider a
completely inelastic collision between two
identical masses A and B, where B is initially
stationary.The final rest mass of the AB lump
isA 2mB smaller than 2mC larger than
2m
5
Consider a completely inelastic collision between
two identical masses A and B, where B is
initially stationary.The final rest mass of
the AB lump is larger than 2m. The rest mass
of an object containing internal parts will
increase if the internal parts move faster in the
rest frame of the object. The rest mass will
also increase if there is any stored internal
energy.(Consider two masses connected by a
spring its clear from P conservation that the
mass increases when the masses are moving. But
when the spring is stretched or compressed, they
arent moving, but the mass cant be different
from when they are moving.)
6
We will call ?m the effective mass or even
sometimes just the mass. Px ?m v cPt ?m c2
mc2 K At low speeds, these expressions turn
into Newtonian formulas for P and K.