Question

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Answer 1

Answer:

(I) 70 km/h

(ii) 112.5km/h

(iii) no

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Answer 2

Answer:

Explanation:

(i)  Distance covered b/w 12:00 & 12:30

= 65 -30

= 35 km

Time = 30 min = $\frac{1}2}$ hour

Speed = $\frac{Distance covered}{time taken}$

= $\frac{35}{\frac{1}{2} }$

=70 km/h

(ii) Total distsance covered = 100 km

Total time taken = 2 hours

Average Speed = $\frac{Total distance covered}{Total time taken}$

= $\frac{100}{2}$

= 50 km/h

(iii)  No car is not in the uniform motion. In the first half hour it covers a distance of 30 km while it doesn't changes its position for the next half hour.