Question

4. How many seconds will it take for a satellite to travel 450 km at a rate of 120 m/s? Hint - first convert km to
m. ​

Answer 1

Given :-

Distance covered by the satellite = 450 km

Velocity of the satellite = 120 m/s

To Find :-

Time taken by the satellite.

Analysis :-

Here we are given with the distance and the speed of the satellite.

In order to find the time taken substitute the given values in the question accordingly such that time is equal to distance covered divided by the time taken.

Solution :-

We know that,

• d = Distance
• s = Speed
• t = Time

Using the formula,

$\underline{\boxed{\sf Time \ taken=\dfrac{Distance \ covered}{Speed \ applied}}}$

Given that,

Distance (d) = 450 km = 450000

Speed (s) = 120 m/s

Substituting their values,

⇒ t = d/s

⇒ t = 450000/120

⇒ t = 45000/12

⇒ t = 3750 sec

Therefore, the time taken by the satellite is 3750 sec.

Answer 2

we know that ,

s = $\frac{d}{t}$ ⇒ $\frac{distance}{time}$

where  s = speed

           d=distance traveled

           t = time elapsed

• The distance travelled by the satellite  d = 450 km

                                                                            d = 450 * 1000 m

• The speed of the satellite is                 s = 120 m/s

Using the above equation we get ,

                                   t = $\frac{d}{s}$

                                     = $\frac{450000}{120}$ sec

                                   = 3750 sec