Yes, the ball undergoes straight-line motion along the inclined track. Its motion can be represented by a horizontal line. Since the ball moves in one direction without reversing, total distance and displacement magnitude are equal at A, B, C and D.
A ball rolls down an inclined track as shown in Fig. 4.6. Is its motion, a straight line motion? Assuming the starting point of the ball (O) to be the origin, can its motion from O to D be depicted using a horizontal line as shown in Fig. 4.3? Are the values of total distance travelled and magnitude of displacement from O equal or different at positions A, B, C and D?
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Yes, the ball’s motion is straight-line motion because it moves along the straight inclined track from O to D. Taking O as the origin, its motion can be represented using a horizontal line showing its successive positions. Since the ball continuously moves in the same direction without changing its path, the total distance travelled and the magnitude of displacement are equal at positions A, B, C and D.
For more NCERT Solutions of Class 9 Science Exploration Chapter 4 Describing Motion Around Us Question Answer (2026-27)
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