Question

Physics

Answer 1

Answer:

a) Josef jogging from A to B;

i. speed = 2 m/s

ii. velocity = 2m/s

a) a) Josef jogging from A to C;

speed = 1.9 m/s

ii. velocity = 2.2 m/s

Step-by-step explanation:

One major difference between speed and velocity is that speed is a scalar quantity, while velocity is a vector quantity.

a) Josef jogging from A to B;

distance = 300 m

time = 2.5 seconds = 150 seconds

i. his average speed = $\frac{distance}{time}$

                               = $\frac{300}{150}$

                               = 2 m/s

ii. his average velocity = $\frac{displacement}{time}$

                               = $\frac{300}{150}$

                               = 2 m/s

b) Josef jogging from A to C,

distance = 300 + 100 = 400 m

time = 2.5 + 1 = 3.5 minutes

        = 210 seconds

i. his average speed = $\frac{distance}{time}$

                                  = $\frac{400}{210}$

                                  = 1.9 m/s

ii. his average velocity = $\frac{\sqrt{V_{1} ^{2} + V_{2} ^{2} } }{2}$

$V_{1} ^{2}$ = 4 m/s

$V_{2} ^{2}$ = 1.9 m/s

his average velocity = $\frac{\sqrt{4^{2} + 1.9^{2} } }{2}$

                                  = 2.2 m/s