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A projectile is projected with velocity of 25 m/s at an angle θ with the horizontal. After t seconds its inclination with horizontal becomes zero. If R represents horizontal range of the projectile, the value of θ will be [use g = 10 m/s 2 ]

1. ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ R 4 t 5 sin 2 1 2 1 –
2. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ 2 1 – t 5 R 4 sin 2 1
3. ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ R 5 t 4 tan 2 1 –
4. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ 2 1 – t 20 R cot

Correct answer: ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ 2 1 – t 20 R cot

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