Acannonball is launched from the ground at an angle of 30 degrees above the horizontal and a speed of 30 m/s. ideally (no air resistance) the ball will land on the ground with a speed of a. 0 m/s. b. 20 m/s. c. 30 m/s. d. 40 m/s. e. there is not enough information to say.

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.

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Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)