First slide

Instantaneous velocity

Question

Displacement of a particle moving along a straight line is given by x = (12t – t2) m where t is time in second. Then the time after which the particle momenttarly stops is

Moderate

A
8 sec
B
6 sec
C
4 sec
D
12 sec

Solution

$v = \frac{d x}{d t} = 12 - 2 t V e l o c i t y v = 0 a t t = 6 s$

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