Straight LineHard

Question

A lizard, at an initial distance of 21 cm behind an insect, moves from rest with an acceleration of 2 cm/s2 and pursues the insect which is crawling uniformly along a straight line at a speed of 20 cm/s. Then the lizard will catch the insect after

Options

A.20 s
B.1 s
C.21 s
D.24 s

Solution

2t2 = 21 + 20t
⇒   t = 21.

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