In the absence of air resistance, a projectile launched at the same speed at any angle will attain the greatest range when projected at
1) 30°.
2) 45°.
3) 60°.
4) 90°.
In the case of throwing a heavy spear, not at the same speed but with the same force, the greatest range is attained more likely when thrown at
5) 30°.
6) 45°.
7) 60°.
8) 90°.
Answer: 2, 5
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