A car starts moving rectilinearly from rest with 5ms -2 form sometime, then uniformly and finally decelerates at 5 ms -2 and come to a stop. The total time of motion equal 25 s. How long does the car move uniformly? Given V av = 72 km/h during motion.
Text Solution
Verified by ExpertsThe correct answer is:
D
Total distance covered = area under v – t graph. From fig.
20 × 25 = 5t 1 2 + (25 – 2t 1 ) 5t 1
or 5t 1 2 – 125 t 1 + 500 = 0
or (t 1 - 5) (t 1 - 20) = 0
⇒ ⇒ t 1 = 5s discard t 1 = 20 s.
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