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1. A projectile is shot from the ground at speed v0=10 m/s making an angle q=50...

1. A projectile is shot from the ground at speed v0=10 m/s making an angle q=50 degrees with the positive direction of the x-axis (horizontal). Find the time at which the velocity vector makes an angle of 30 degrees with the positive direction of the x-axis (horizontal).

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