Physics
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A small ball hangs from the ceiling of a bus by a cord. As the bus gradually speeds up from a standstill to 24 m/s in 4.0 s, what angle Φ is formed by the cord with the vertical?
Φ=1ο\Phi=1^{\omicron}Φ=1ο
Φ=31ο\Phi=31^{\omicron}Φ=31ο
Φ=45ο\Phi=45^{\omicron}Φ=45ο
Φ=59ο\Phi=59^{\omicron}Φ=59ο