Question

Which of the two speeds is greater: 20 m per second or 90 km. per hour?with solution​

Answer 1

Answer 2

Step-by-step explanation:

speed 1 = 20m/sec

speed 2 = 90 km/hr

we know that

1 km / hr = 1000m / 60 × 60 sec = 1000m / 3600 sec

converting 2nd speed from km/hr to m/sec

.•. 90km/h = 90 × (1000 m / 3600 sec)

= 90 × (5m/18 sec)

= 5 × 5

= 25 m / sec

so speed 2 is greter than speed 1

tips :

always remember to campair quantities in same units