A projectile is thrown upward at an angle with the horizontal. The speed of the projectile is 20 m/s when its direction of motion is with the horizontal. The initial speed of the projectile is ________ m/s. [2026]

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Solution

Q.
A projectile is thrown upward at an angle $60 °$ with the horizontal. The speed of the projectile is 20 m/s when its direction of motion is $45 °$ with the horizontal. The initial speed of the projectile is ________ m/s. [2026]

1 $40$

2 $20 \sqrt{3}$

3 $20 \sqrt{2}$

4 $40 \sqrt{2}$

Ans.
(3)

$u \cos 60 ° = \frac{20}{\sqrt{2}}$

$\frac{u}{2} = \frac{20}{\sqrt{2}}$

$u = \frac{40}{\sqrt{2}}$

$u = 20 \sqrt{2} m/s$

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