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PEAZIT Aha card

Convert both distance and time; “per hour” is the denominator.

The same motion in different units.

Distance	Time	Speed
36 km	1 h	36 km/h
36 000 m	3 600 s	10 m/s

Watch out: A number needs a unit. Converting units changes neither the speed nor whether the motion was uniform.

Goal, prerequisites and card origin

What you will learn: Convert a speed from km/h to m/s.

What you need first: 1 km = 1,000 m, 1 h = 3,600 s.

An original PEAZIT working card. Independent expert review and effectiveness testing have not yet taken place. · v1

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One length, different units

Measured length — can be expressed in — Metre: m

Metre: m — 1 m = 100 cm — Centimetre: cm

Centimetre: cm — 1 cm = 10 mm — Millimetre: mm

Metre: m — 1 m = 1,000 mm — Millimetre: mm

Convert both distance and time; “per hour” is the denominator.

Without JavaScript, write your answer elsewhere before opening the solution.How many m/s is 72 km/h? Enter the number.

Solution — open after your own attempt

20 m/s 72,000 / 3,600 = 20. This is equivalent to dividing by 3.6.

A question for your next return: How many km/h is 5 m/s? Enter the number.

Solution — open after your own attempt

18 km/h 5 × 3,600 = 18,000 metres per hour, or 18 km/h.

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