Answer:

Explanation:
Hello,
In this case, since the acceleration in terms of position is defined as its second derivative:

The purpose here is derive x(t) twice as follows:

Thus, the acceleration turns out 4.8 meters per squared seconds.
Best regards.
Actually its three way
Neutrons
Electrons
protons
Answer: (b)
Explanation:
Given
mass of Student M=40 kg
mass of box m=3 kg
velocity of box v=8 m/s
suppose u is the velocity of the student after the throw
As there is no external force is applied so momentum is conserved
Initial momentum=final momentum=0
0=Mu+mv
Mu=-mv

Here negative sign indicates the velocity is opposite in direction i.e. opposite to the direction of the box