A plane is inclined at an angle $\alpha$= 300 with respect to the horizontal.  A particle is projected with a speed u= 2 m, from the base of the plane, making an angle  150 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 = 10 ms−2) (a) 18 cm (b) 20 cm (c) 14 cm (d) 26 cm

Question ID - 51352 :- A plane is inclined at an angle $\alpha$= 300 with respect to the horizontal.  A particle is projected with a speed u= 2 m, from the base of the plane, making an angle  150 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 = 10 ms−2) (a) 18 cm (b) 20 cm (c) 14 cm (d) 26 cm

3537

Time of flight  =

T=

Range = Tgsin30

=

=.1952m=20 cm

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 A bullet of mass 20g has an initial speed of 1 m just before it starts penetrating a mud wall of thickness 20cm.  If the wall offers a mean resistance of 2.5 N, the speed of the bullet after emerging  from the other side of the wall is close to : (a) 0.4 m (b) 0.7 m (c) 0.3 m (d) 0.1 m