The rate of change of motion of an object can be known by measuring the _____ of the object.

Rate of change of motion is the speed of an object. It needs both distance and time to be calculated. Hence, option 1 and 2 are wrong. The correct answer is option 3.

A car is covering a distance of 10 metres every 4 seconds along a straight path. Which motion is the car in?

The object is moving in a straight path, so it is in linear motion. Now, the object is also covering equal distance in equal time interval which shows the object is in uniform motion. Hence, option 4 is the correct answer.

A car is covering a distance of 60 km. It covers the first 30 km in 40 minutes and the remaining distance in 20 minutes. What will be the average speed of the car in metre per second?

Total distance = 30 km + 30 km = 60 km Total time taken = 40 minutes + 20 minutes = 60 minutes = 1 hour Average speed = Total distance / Total time taken = 60/1 = 60 km/hr Average speed in metre/second = 60 × 1000/3600 = 16.667 m/sec [1 km = 1000 m & 1 hour = 3600 seconds]

Vehicle A covers a distance of 100 km in 2 hours, and vehicle B covers a distance of 300 km in 5 hour. Which vehicle is faster and by how much?

To find the faster vehicle, we have to find the speed of both the vehicles. Speed of vehicle A = 100/2 = 50 km/hr Speed of vehicle B = 300/5 = 60 km/hr Hence, vehicle B is faster by 10 km/hr.

Which of the following statements is false?

The speed of an object in uniform motion is constant. Therefore option 3 is the correct answer.