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23 April, 00:55

A bike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. What is her acceleration?

Select one:

a. 3.21 m/sec2

b. 1.75 m/sec2

c. 9.80 m/sec2

d. 2.24 m/sec2

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Answers (1)
  1. 23 April, 01:02
    0
    d. 2.24 m/s²

    Explanation:

    Acceleration: This is defined as the rate of change of velocity. The S. I unit of acceleration is meter per seconds squared. (m/s²). Acceleration is a vector quantity, and its is represented in one of newtons equation of motion.

    which is expressed below.

    S = ut + 1/2at² ... Equation 1

    making a the subject of the equation above,

    a = 2 (S-ut) / t² ... Equation 2

    Where a = acceleration, S = distance, u = initial velocity, t = time taken

    Given: s = 28 m, u = 0 (from rest), t = 5.00 s.

    Substituting these values into equation 2

    a = 2 (0*5 + 28) / 5²

    a = 56/25

    a = 2.24 m/s²

    Therefore the acceleration of the body is 2.24 m/s²

    The right option is d. 2.24 m/s²
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