Practice the questions given in the worksheet on conversion of units of speed. The questions are based on converting the speeds from km/hr to m/sec and converting the speeds from m/sec to km/hr.

We know, (i) to convert km/hr to m/sec, multiply by 5/18 and

(ii) to convert m/sec to km/hr, multiply by 18/5.

**1. Convert each of the following speed into m/sec:**

(i) 72 km/hr

(ii) 12.6 km/hr

(iii) 23.4 km/hr

(iv) 306 km/hr

(v) 38 km/hr

(vi) 54 km/hr

(vii) 81 km/hr

(viii) 14.4 km/hr

**2. Convert each of
the following speed into km/hr:**

(i) 45 m/sec

(ii) 4 m/sec

(iii) 1.5 m/sec

(iv) 2.8 m/sec

(v) 22.5 m/sec

(vi) 120 m/sec

(vii) 840 m/sec

(viii) 6.25 m/sec

**3. Express the
following speed in m/sec.**

(i) 36 km/hr

(ii) 90 km/hr

(iii) 144 km/hr

(iv) 7.2 km/hr

(v) 12.8 km/hr

**4. Express the
following speed in km/hr.**

(i) 15 m/sec

(ii) 10.5 m/sec

(iii) 24 m/sec

(iv) 30 m/sec

(v) 4 ½ m/sec

**5.** Which is greater – a speed of 24 km/hr or a speed of 12.8 m/sec?

**6.** Ron covers a
distance of 1710 m in 3 minutes. Find his speed in km/hr.

Answers for the worksheet on conversion of units of speed are given below to check the exact answers after converting.

**Answers:**

**1.** (i) 20 m/sec

(ii) 3.5 m

(iii) 6.5 m

(iv) 85 m

(v) 10 5/9m

(vi) 15 m

(vii) 22.5 m

**2.** (i) 162 km

(ii) 14.4 km

(iii) 5.4 km

(iv) 10.08 km

(v) 81 km

(vi) 432 km

(vii) 3024 km

(viii) 22.5 km

**3.** (i) 10 m/sec

(ii) 25 m/sec

(iii) 40 m/sec

(iv) 2 m/sec

(v) 3 5/9 m/sec

**4.** (i) 54 km/hr

(ii) 37.8 km/hr

(iii) 86.4 km/hr

(iv) 108 km/hr

(v) 16.2 km/hr

**5.** 12.8 m/sec

**6.** 34.2 km/hr

Worksheet on Conversion of Units of Speed

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