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Grade: 9
        

A stone is projected from the ground with velocity 25 m/s. two seconds later, it just clears a wall 5m high. The angle of projection of the stone is (g=10m/sec2)


(a)    30°


(b)    45°


(c)    50.2°


(d)    60°

7 years ago

Answers : (4)

vikas askiitian expert
509 Points
							

let angle of projection is @ then we have

Ux = 25cos@

Uy = 25sin@

after 2 sec it clears a wall of 5m height that means its height from ground is nearly 5m ...

H = Uyt - gt2/2

5 = 25sin@*2 - 10*4/2

5 + 20 = 50sin@

 sin@ = 1/2 or @ = 30o

7 years ago
shubham pansare
15 Points
							

(a) 30 degrees.

7 years ago
Fawz Naim
37 Points
							

intial velocity of the projectile is u=25m/s. time t=2s,h=5m

let angle of projection be theta. the increase in the height of the projectile above the ground is due to the vertical component of the initial velocity which is equal to usintheta. Applying second equation of motion

5=usintheta*2-1/2*10*(2)^2

5=usintheta*2-20

usintheta=25/2

sintheta=25/2*25

sintheta=25/50=1/2

theta=30degree

7 years ago
S Sharma
15 Points
							
Yep correct answer. I'm loving this really specially the questions based upon different types of motion so thanks
18 days ago
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