Here are three numerical questions on motion suitable for Class 9 students, complete with detailed explanations.
Question 1: Calculating Speed
A car travels a distance of 150 km in 3 hours. What is the speed of the car?
- Formula: Speed = Distance / Time
- Calculation:
- Distance = 150 km
- Time = 3 hours
- Speed = 150 km / 3 hrs = 50 km/hr
- Answer: The speed of the car is 50 km/hr.
Question 2: Finding Distance
A cyclist moves at a speed of 12 km/hr for 2.5 hours. How far does the cyclist travel?
- Formula: Distance = Speed x Time
- Calculation:
- Speed = 12 km/hr
- Time = 2.5 hours
- Distance = 12 km/hr x 2.5 hrs = 30 km
- Answer: The cyclist travels a distance of 30 km.
Question 3: Calculating Time
A train travels 240 km at a constant speed of 60 km/hr. How long does the journey take?
- Formula: Time = Distance / Speed
- Calculation:
- Distance = 240 km
- Speed = 60 km/hr
- Time = 240 km / 60 km/hr = 4 hours
- Answer: The journey takes 4 hours.
These questions help reinforce the understanding of basic motion concepts such as speed, distance, and time, which are fundamental in physics.