1. When a ball is thrown, the horizontal distance travelled, d, in metres, can be modelled by the equation g sin 20, where g =
1. When a ball is thrown, the horizontal distance travelled, d, in metres, can be modelled by the equation g sin 20, where g = 9.8 , v is the velocity with which the ball is thrown, in metres per second, and ( is the angle of elevation, in radians. If a ball is thrown at 40 m/s, what angle of elevation is required for the ball to travel 40 m
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