A body of mass 5 kg starts from the origin with an initial velocity u = 30 i ^ + 40 j ^ m s - 1 . If a constant force - 6 i ^ - 5 j ^ N acts on the body, the time in which the y component of the velocity becomes zero is

From Newton's second law of motion, F y = △ P y △ t △ t = △ P y F y = 0 - 5 × 40 - 5 = 40 s

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PhysicsNLMMiscellaneousEasy2 minPYQ_2020

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A body of mass $5 kg$ starts from the origin with an initial velocity $u = (30 \hat{i} + 40 \hat{j}) m s^{- 1}$ . If a constant force $(- 6 \hat{i} - 5 \hat{j}) N$ acts on the body, the time in which the $y$ component of the velocity becomes zero is

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Answer:

Solution:

From Newton's second law of motion,

$F_{y} = \frac{△ P_{y}}{△ t}$

$△ t = \frac{△ P_{y}}{F_{y}}$

$= \frac{0 - (5 \times 40)}{- 5} = 40 s$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:NLMSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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