Ncert solutions

Ncert solutions

Grade 7

Motion and Time | Exercise

Question 9

Q10) A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes.

The total distance covered by the car is:

(i) 100 km

(ii) 25 km

(iii) 15 km

(iv) 10km

Solution:

(ii) 25 km

Speed (s1) = 40km/h

Time (t1) = 15 mins = (15/60) hr

Distance d1 = (s1 × t1) = 40 × (15/60) = 10 km

Speed (s2) = 60 km/h

Time (t2) = 15 min = (15/60) hour

Distance (d2) = (s2 × t2) = 60 × (15/60) = 15 km

Total distance (d) = (d1 + d2) = 10 km + 15 km = 25 km

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subject-cta

Question 9

Q10) A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes.

The total distance covered by the car is:

(i) 100 km

(ii) 25 km

(iii) 15 km

(iv) 10km

Solution:

(ii) 25 km

Speed (s1) = 40km/h

Time (t1) = 15 mins = (15/60) hr

Distance d1 = (s1 × t1) = 40 × (15/60) = 10 km

Speed (s2) = 60 km/h

Time (t2) = 15 min = (15/60) hour

Distance (d2) = (s2 × t2) = 60 × (15/60) = 15 km

Total distance (d) = (d1 + d2) = 10 km + 15 km = 25 km

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subject-cta
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