Question

b A 100 metre sprinter covers the first 50 metre in 8 second and the next 25 metre in 3 seconds and the last 25 metre into 4 seconds. Find her average speed. c A man goes from his home to the grocery shop at a speed of 60 km per hour and returns at a speed of 90 km per hour. If the distance from his home to the shop is 900 metre,calculate the total time in minutes that he spends travelling from his home to the shop and back. d. A car travels 35 kilometres in the first 30 minutes and 25 kilometres in the next 20 minutes and 10 kilometres on the last leg of its journey. If the average speed of the car is 70 kilometre per hour find out how long it takes to cover the last leg of its joumey? e a cyclist travels for 20 minutes at a speed of 30 km per hour and 40 minutes at 15 km per hour. Find the total distance she travels and calculate the average speed f. A car travels from Chennai to puducherry at 50 km per hour and returns from puduchery to Chennai at 60 kilometre per hour. Find the average speed of the car. g.find the weight in Newton of an iron block of mass 30 kg on Earth and Moon. Take 1 kgf=10 N h. 9 kg mass weighs 15 N on the moon. What are its mass and weight on Earth?​

Answer 1

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