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7. MOTION
easy
Answer the following questions
$(i)$ State the type of motion shown by a freely falling stone.
$(ii)$ When a stone is thrown vertically upwards its velocity is continuously decreased. Why ?
$(iii)$ Give an example of a motion in which average velocity is zero, but the average speed is not zero.
Option A
Option B
Option C
Option D
Solution
$(i)$ Uniform motion.
$(ii)$ The stone is continuously being attracted by the earth, this causes retardation in the stone's motion, hence its velocity goes on decreasing continuously
$(iii)$ Uniform circular motion.
Standard 9
Science