1. The line segment BC on the distance vs. time graph given above indicates that the object is moving at a constant speed.   True   False   2. The rate of change of displacement is called   force   acceleration   velocity   speed   Hint Half-n-half Clue   3. The rate of change of velocity is called   momentum   speed   acceleration   force   Half-n-half Clue   4. If an object moves through equal distances in equal times, then it is moving at a constant _______.   velocity   acceleration   displacement   speed   Half-n-half Clue   5. Acceleration = (change in _______) / (time taken for that change)   speed   velocity   force   displacement   Half-n-half Clue   6. A bus covers a distance of 90 miles in 3 hours. Its average speed in miles per hour is   3   30   270   None of these   Half-n-half Clue   7. The acceleration due to gravity on the Earth's surface is   0.98 m/s2   9.8 m/s2   98 m/s2   980 m/s2   Half-n-half Clue