The velocity of a projectile at the initial point A is (2i + 3j) m/s. Its velocity (in m/s) at point B is (a) 2i - 3j (b) 2i + 3j (c) -2i - 3j (d) -2i + 3j

Answer: (a). Horizontal velocity stays 2 i throughout. B is at the same level as A, so the vertical velocity has the same size but is reversed: -3 j So the answer is (a) 2 i - 3 j.

The velocity of a projectile at the initial point A is (2i + 3j) m/s… | NEET 2013

Q15NEET 2013Easy

Velocity, Momentum & Energy in Flight

The velocity of a projectile at the initial point A is $\left(2\hat{i} + 3\hat{j}\right)$ m/s. Its velocity (in m/s) at point B is

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Answer: (a)

Horizontal velocity stays $2\hat i$ throughout.
B is at the same level as A, so the vertical velocity has the same size but is reversed: $-3\hat j$
So the answer is (a) $2\hat i - 3\hat j$ .

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