(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 9.57 m/s when going down a slope for 1.97 s? (b) How far does the skier travel in this time?(a)Number_______ Units _________(b)Number_______ Units _________

Respuesta :

Given,

The initial velocity of the skier, u=0 m/s

The final velocity of the skier, v=9.57 m/s

The time duration, t=.97 s

(a)

From the equation of motion,

[tex]v=u+at[/tex]

Where a is the acceleration of the skier.

On substituting the known values,

[tex]\begin{gathered} 9.57=0+a\times1.97 \\ \Rightarrow a=\frac{9.57}{1.97} \\ =4.86\text{ m/s}^2 \end{gathered}[/tex]

Thus the magnitude of average acceleration of the skier is 4.86 m/s²

(b)

The distance traveled by the skier is given by one of the equations of motion as,

[tex]s=ut+\frac{1}{2}at^2[/tex]

On substituting the known values,

[tex]\begin{gathered} s=0+\frac{1}{2}\times4.86\times1.97^2 \\ =9.43\text{ m} \end{gathered}[/tex]

The skier travels for 9.43 m in the given time.