A car traveling at constant speed travels 150 km in 7200 s. what is the speed of the car? Express the speed to two significant figures and include the appropriate units?

**Answer:**

The speed of the car is **75 km/h**

### Further explanation

These are the formulas that we have to remember before solving the problem.

**Speed** is the rate of change of distance.

*v = speed ( m/s )*

*d = distance ( m )*

*t = time ( s )*

**Acceleration** is the rate of change of velocity.

*a = acceleration ( m/s² )*

*Δv = change in speed ( m/s )*

*t = time ( s )*

Let us now tackle the problem!

__Given:__

distance = d = 150 km

time taken = t = 7200 s = 2 hours

__Unknown:__

velocity = v = ?

__Solution:__

The acceleration of the car is **0 m/s²** because it travels at a constant speed.

We could also plot the **distance vs time graph** as shown in the attachment.

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