Laws Of Motion MCQ | CBSE, IIT JEE, NEET And CET Problems with Solution | Practice

Q.1. A man can swim with a speed of 4.0 km h¯¹ in still water. How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0 km h¯¹ and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank?

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Q. 2. The position of a particle is given by 

$r=(3.0t{i}^{}-2.0{\mathrm{t²}}^{}$$j^{}+4.0{\mathrm{k)}}^{}m$ where t is in seconds and the coefficients have the proper units for r to be in metres.

A) Find the Velocity and Acceleration of the particle ?
B) What is the magnitude and direction of velocity of the particle at t = 2.0 s ?

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