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Question

A plane is inclined at an angle α=30o with a respect to the horizontal. A particle is projected with a speed u=2ms1 from the base of the plane, making an angle θ=15o with respect to the plane as shown in the figure.The distance from the base, at which the particle hits the plane is close to :
(Take g=10ms2)
1614660_a2e021cb9ab443f2a685c22bba330a42.png

A
14cm
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B
20cm
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C
18cm
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D
26cm
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Solution

The correct option is B 20cm
t=2×2×sin15ogcos30o
S=2cos15o×t12gsin30ot2
put values and solve
S20cm

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