Question

A truck takes 20 s to travel the first 80 m, and another 10 s to travel a further 70 m. What is the average speed?

Answer 1

Answer:

Explanation:

speed 1 = 80/20 = 40 m/sec

speed 2  = 70/10 = 7 m/sec

avg speed = total speed / no of speed = 40 + 7 /2 = 47/2 = 26.5 m/ sec

hope it helps you

Answer 2

Answer:-

$\red{\bigstar}$ Average speed $\large\leadsto\boxed{\rm\purple{5 \: ms^{-1}}}$

• Given:-

Time taken by 1st truck = 20 sec.

Time taken by 2nd truck = 10 sec.

Distance travelled by 1st truck = 80 m

Distance travelled by 2nd truck = 70 m

• To Find:-

Average speed = ?

• Solution:-

$\boxed{\bf\pink{Average \: speed [s] = \dfrac{Total \: Distance [d]}{Total \: time[t]}}}$

here,

Total Distance = 80 m + 70 m

→ 150 m

Total Time = 20 sec + 10 sec

→ 30 sec.

• Substituting in the Formula:-

✧$\large\boxed{\bf{s= \dfrac{d}{t}}}$

$\dashrightarrow\sf{s = \dfrac{150}{30}}$

$\dashrightarrow\large\sf\green{s = 5 \: m/s}$

Therefore, the average speed is 5 ms-¹

$\purple{\bigstar}$ Explore More::

• Average speed is the total distance travelled by the object to the total time elapsed or time taken to cover that distance.

• In order to calculate the average speed of an object, we must know the Distance travelled by that object and the total time taken by the object to travel that distance.

• $\sf{Average \: speed [s] = \dfrac{Total \: Distance [d]}{Total \: time[t]}}$

• $\sf{Total \: time[t] = \dfrac{Total \: Distance [d]}{Total \: Speed [s]}}$

•$\sf{Total \: Distance [d] = Total \: Speed [s] \times Total \: time [t]}$