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

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

1 Answer

5876 Votes

score 3537 · Accepted Answer

Answer Key : (b) -

Time of flight =

T=

Range = Tgsin30

=

=.1952m=20 cm

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