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Answer :

Time taken by Salma to reach her school by bicycle = 15 mins= 15 x 60 = 900 s

Speed = 2 m/s

Distance = speed x time = 2 x 900= 1800 m

Also 1 km= 1000 m

Therefore 1800x (1/1000) = 1.8 km

Therefore, the distance between her house and the school is 1.8 km .

- Q.1 Classify the following as motion along a straight line, circular or oscillatory motion : (i) Motion of your hands while running. (ii) Motion of a horse pulling a cart on a straight road. (iii) Motion of a child in a merry-go-round. (iv) Motion of a child on a see-saw. (v) Motion of the hammer of an electric bell. (vi) Motion of a train on a straight bridge.
- Q.2 Which of the following are not correct? (i) The basic unit of time is second. (ii) Every object moves with a constant speed. (iii) Distances between two cities are measured in kilometres. (iv) The time period of a given pendulum is constant. (v) The speed of a train is expressed in m/h.
- Q.3 A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?
- Q.4 The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
- Q.5 The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.
- Q.7 Show the shape of the distance-time graph for the motion in the following cases : (i) A car moving with a constant speed. (ii) A car parked on a side road
- Q.8 Which of the following relations is correct? (i) Speed = Distance × Time (ii) Speed = Distance/Time (iii)Speed – Time/Distance (iv)Speed = 1/Distance ×Time
- Q.9 The basic unit of speed is: (i) km/min (ii) m/min (iii) km/h (iv) m/s
- Q.10 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) 10 km
- Q.11 Suppose the two photographs, shown in Fig. 13.1 and Fig. 13.2, had been taken at an interval of 10 seconds. If a distance of 100 metres is shown by 1 cm in these photographs, calculate the speed of the fastest car.
- Q.12 Fig. 13.15 shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?
- Q.13 Which of the following distance-time graphs shows a truck moving with speed which is not constant?

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