(e) 130cm = (f) 789cm = (d) 500m = ..km m -..... (g) 2400m = .......... km (h) 6800m = km (1) 48mm = ст 4. Super extension! 1) Mr Fast runs 3.7km. Mr Slow runs 630m. How much further does Mr Fast run than Mr Slow? 2) Add together 4.5km, 120m and 50cm 3) I have four pieces of string. They are 3m, 45cm and 25cm long. What total length in cm do I have? 4) A square field has a perimeter of 3.6 km. What is the length of one side in metres? 5) A mountain peak is 4.26 km above sea level. A climber is 540m below the summit. How high above sea level is the climber?

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Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.