We use velocity instead of speed in formulas because velocity includes both magnitude and direction, while speed only measures magnitude. Velocity provides more detailed information about an object's motion.

1. distance = speed into time

= 50km/hr into 1hr

= distance covered 50 km

*total distance to house = 140km

*remaining distance = 140-50 = 90 km

speed = 25m/s

*after converting speed = 25m/s into 3600 / 1000 m = 90 km/hr

speed = 90km / hr

distance = 90 km

*time = distance divided by speed

= 90km divided by 90km/hr = 1hr

travel time after 7:00 pm = 1hr

arrival time = 7:00 pm + 1hr = 8:00 pm

*so the person reaches the house at = 8:00 pm

1. A cheetah sprinting, a bullet train traveling, or Usain Bolt running are real-life examples of speed.

2. Speed is how fast something moves, while acceleration is how quickly that speed changes.

3. Factors like force, mass, friction, and air resistance can affect an object's speed.

4. Planes are fastest, cars and trains are moderate, and bicycles are the slowest among common modes of transportation.

5. You can determine speed from a distance-time graph by finding the slope of the line (distance divided by time).

6. total distance = 30km + 20km , total time = 2 hours + 1hour

average speed = total distance / time

= 50 km / 3 hrs = 16.67 km/hr

7. distance travelled = 42,250 km , time taken = 24 hrs

average speed = total distance taken / total time

average speed = 42,250/24 = 1,760 km/hr

8 . To convert km/h to m/s, divide the speed by 3.6.

formula of speed is - speed = distance / time

it shows how fast an object moves over a given distance in a certain time