Question

A motorcycle has been travelling 13.75 km within 30 minutes. It made a u-turn and continued travelling for 7.39
for 20 minutes. What is the (a) speed, (b) velocity of the motorcycle?

Answer 1

Answer:

bigger ball transfers greater momentum

than smaller

Answer 2

Given: A motorcycle has been travelling 13.75 km within 30 minutes. It made a U-turn and continued travelling for 7.39 km for 20 minutes.

To find:

(a) Speed of the motorcycle.

(b) Velocity of the motorcycle.

Solution:

(a)

• Speed is of an object is the total distance travelled in total time.
• In the given question the total distance is,

        $13.75 km + 7.39 hm = 21.14 km$

• And, the total time the motorcycle travelled for is,

        $30 + 20 = 50 minutes$

                     $= 0.83 hours$

• So, the speed can be calculated as,

        $speed = \frac{21.14km}{0.83hr}$

                  $= 25.47kmhr^{-1}$

(b)

• Velocity of a body is the change in the position of the body with respect to the change in time.
• The change in the position of the motorcycle is,

        $13.75 km - 7.39 hm = 6.36 km$

• And, the change in time is,

        $30 - 20 = 10 minutes$

                     $= 0.17 hours$

• So, the velocity of the motorcycle is calculated as,

        $velocity = \frac{6.36km}{0.17hr}$

                      $= 37.41 kmhr^{-1}$

Therefore,

(a) the speed of the motorcycle is 25.47 kmhr⁻¹.

(b) the velocity of the motorcycle is 37.41 kmhr⁻¹.