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A body with mass 5 kg is acted upon by a force F= (–3ȋ + 4ĵ)N. If its initial velocity at t = 0 is v=(6ȋ-12ĵ) m/s , the time at which it will just have a velocity along the y-axis is

(a) Never

(b) 10 s

(c) 2 s

(d) 15 s

0 3 Views | Posted 3 months ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    3 months ago

    This is a Multiple Choice Questions type Questions as classified in NCERT Exemplar

    Answer- b

    Explanation-  we know that m= 5 kg

    F= (–3? + 4? ) N and

    initial velocity v= (6? -12? ) m/s

    So retardation a= F m  = ( - 3 ? 5 + 4 ? 5 ) m/s2

    We know v=u+at, for X-component only ,0 = 6? - 3 ? 5 t

    So t= 5 × 6 3 = 10s

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