A particle is projected vertically upward with initial velocity 25 ms -1 . During third second of its motion, which of the following statement is correct?
Text Solution
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Displacement of the particle during third second of the motion (i.e. between t = 2s and t = 3s) is zero. Hence t = 2.5 sec is the turning point of the motion.
For distance S t = 2 = 25 × × 2 − − 
× × 10 × × 2 2 = 30 m
and S t=2.5 = 25 × × 2.5 − − 
× × 10 × × 2.5 2 = 31.25 m
Hence distance covered by the particle during third second of motion = 2 (31.25 − − 30) = 2.5 m,
Hence is correct.
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