Numerical - Time required to attain velocity for applied constant force

Q.  A constant force of 150 N is applied on a block of 5 kg on a horizontal surface. What is the time required to attain velocity of 40 m/sec by the block?
- Published on 18 Sep 15

a. 0.8 sec
b. 1 sec
c. 1.33 sec
d. None of the above

ANSWER: 1.33 sec

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    Discussion

  • Sravanthi   -Posted on 15 Dec 15
    Given: Force = 150 N, mass of block = 5 kg, velocity = 40 m/s

    Formula: F = ma

    According to Newton's 2nd law, rate of change of linear momentum is directly proportional to impressed force.

    1) F = ma

    150 = 5 x a

    a = 30 m/s2

    2) Using kinematic equation, v = u +at

    40 = 0 + (30 x time)

    Time required to attain velocity of 40 m/sec by the block is 1.33 sec.

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