Q77 / 90 · JEE Main 2017 (08 Apr Online) · Physics

The ratio of maximum acceleration to maximum velocity in a simple harmonic motion is 10 s-1. At, t=0 the displacement is 5 m. What is the maximum acceleration? The initial phase is π4 .

  • A
    500 m s-2
  • B
    7502 m s-2
  • C
    750 m s-2
  • Correct answer
    D
    5002 m s-2

Solution

In a simple harmonic motion,

Maximum acceleration, fmax=ω2A

Maximum velocity, vmax=Aω. 

fmaxvmax=ω2AAω=ω

ω=10

Displacement in SHM is x=Asin⁡ωt+π4

At t=0

5=Asin⁡π4

A=52. 

Max acceleration = ω2A

=100×52

=5002  m s-2 

Hence, the correct answer is option: 'D'.

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