Related Practice Questions :

In 1.0 s, a particle goes from point A to point B, moving in a semicircle of radius 1.0 m (see figure). The magnitude of the average velocity is 

(1) 3.14 m/s

(2) 2.0 m/s

(3) 1.0 m/s

(4) Zero

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The coordinates of a moving particle at any time ‘t’ are given by x = αt3 and y = βt3. The speed of the particle at time ‘t’ is given by 

(1) α2+β2

(2) 3tα2+β2

(3) 3t2α2+β2

(4) t2α2+β2

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Two particles having position vectors r1=(3i^+5j^) metres and r2=(5i^3j^) metres are moving with velocities v1=(4i^+3j^)m/s and v2=(αi^+7j^) m/s. If they collide after 2 seconds, the value of ‘α’ is-

(1) 2

(2) 4

(3) 6

(4) 8

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A particle is moving such that its position coordinates (x, y) are (2m, 3m) at time t=0, (6m, 7m) at time t=2s and (13m, 14m) at time t=5s. Average velocity vector (vav) from t=0 to t=5s is

(a)15(13i^+14j^)

(b)73(i^+j^)

(c)2(i^+j^)

(d)115(i^+j^)

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