In nuclear physics, what particles compose an alpha ( $α$ ) particle?

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In mechanics, a vehicle accelerates uniformly from rest at $2.5 m/s^{2}$ for $6 s$ . What is its final velocity?
In mechanics, how far does an object fall from rest in free fall after $3 s$ (taking $g = 9.8 m/s^{2}$ )?
In mechanics, what net horizontal force is required to accelerate an $800 kg$ car at $1.5 m/s^{2}$ ?
In mechanics, what is the weight of a $60 kg$ person on the surface of the Earth where $g = 9.8 m/s^{2}$ ?
In mechanics, what is the momentum of a $1200 kg$ automobile moving at $20 m/s$ ?
In mechanics, what work is done by a force of $50 N$ pushing a crate $8 m$ along the floor in the direction of the force?