Question

question 7 (1 point)
a jogger runs 5.0 km in 33 min. what is the speed of the jogger?
(a) 0.15 m/s (b) 2.5 m/s
(c) 0.25 m/s (d) 2.8 m/s
a
b
c
d
question 8 (1 point)
you walk 27 m w and 12 m e. what is the total distance you have travelled?
(a) 29 m (b) 15 m
(c) 39 m (d) 25 m
a
b
c
d

Explanation:

Question 7

Step1: Convert distance to meters

The distance \(d = 5.0\mathrm{km}=5.0\times10^{3}\mathrm{m}\)

Step2: Convert time to seconds

The time \(t = 33\mathrm{min}=33\times60\mathrm{s} = 1980\mathrm{s}\)

Step3: Calculate speed using formula \(v=\frac{d}{t}\)

\(v=\frac{5.0\times 10^{3}\mathrm{m}}{1980\mathrm{s}}\approx2.5\mathrm{m/s}\)

Step1: Use the concept of total distance (scalar sum)

The total distance \(D\) is the sum of the magnitudes of individual distances. If \(d_1 = 27\mathrm{m}\) and \(d_2=12\mathrm{m}\), then \(D=d_1 + d_2\)

Step2: Calculate the sum

\(D=27\mathrm{m}+12\mathrm{m}=39\mathrm{m}\)

Answer:

B. \(2.5\mathrm{m/s}\)

Question 8