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Gravity and motion — Question 197

Original QCE Vault practice · 1 mark

Q197 · Practice questionComplex familiar1 mark

QUESTION 197

A projectile passes a particular height once while rising and once while falling. Its rising velocity is (12.0i+9.00j) m s−1(12.0\mathbf i+9.00\mathbf j)\,\mathrm{m\,s^{-1}}, with j\mathbf j vertically upward. Ignore drag. What is the change in velocity from the rising passage to the falling passage?
(A)
−24.0i m s−1-24.0\mathbf i\,\mathrm{m\,s^{-1}}
(B)
−9.00j m s−1-9.00\mathbf j\,\mathrm{m\,s^{-1}}
(C)
(24.0i−18.0j) m s−1(24.0\mathbf i-18.0\mathbf j)\,\mathrm{m\,s^{-1}}
(D)
−18.0j m s−1-18.0\mathbf j\,\mathrm{m\,s^{-1}}
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