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1. Because, velocity vector (vector_v) = magnitude (vector_v) * unit_vector_v
Hence, acceleration can be due to change in direction as well as due to change in magnitude of velocity vector.
As both are constant, therefore acceleration (a) = 0
Because, Force (F) = mass (m) * a
If a = 0, => F =0
Hence, force required to keep the ball moving in a constant direction with constant velocity magnitude = 0 --Answer
A. A rocket in space is able to propel itself in a specific direction at a specific velocity -- Newton's 1st Law (Law of Inertia) -- In absence of net external forces (resultant force = 0), remains in original state.
B. if the sun were vaporized, the earth would continue in a straight liner path indefinitely -- Newton's 1st Law (Law of Inertia) -- In absence of net external forces, remains in original state. -- Whatever were ...
The solution answers various questions regarding force and motion.