Q.

A particle is projected from level ground. Assuming projection point as origin, x-axis along horizontal and y-axis along vertically upwards. If particle moves in x-y plane and its path is given by y=axbx2  where a,b  are positive constants. Then match the physical quantities given in column-I with the values given in column-II. (g in column II is acceleration due to gravity.)

Column – IColumn – II
A) Horizontal component of velocityP) ab
B) Time of flightQ) a24b
C) Maximum height R) g2b
D) Horizontal range S) 2a2bg

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a

A – P, B – Q, C – R, D – S

b

A – Q, B – R, C – P, D – S

c

A – R, B – P, C – S, D – Q

d

A – R, B – S, C – Q, D – P

answer is D.

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Detailed Solution

Equation of path is given as  y=axbx2
Comparing it with standard equation of projectile;
 y=xtanθgx22u2cos2θ
 tanθ=a,g2u2cos2θ=b
Horizontal component of velocity  =ucosθ=g2b
 Time of flight T =2usinθg=2(ucosθ)tanθg=2(g2b)ag=2a2bg Maximum height H =u2sin2θ2g=[ucosθ.tanθ]22g=[g2b.a]22g=a24b Horizontal range R=u2sin2θg=2(usinθ)(ucosθ)g=2[g2b.a][g2b]g=ab
 

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