Question

If angle of projection is 30 degree and initial velocity is (√5 i cap + j cap ) then what will be angle and velocity when
it reached the ground ??

Answer 1

Final velocity will be √5î - j

Explanation:

Data:

The angle of projection: 30°

initial velocity: √5î + j

Solution:

(final angle)f = - (initial angle)i

 θf =  -θi

θf = -30

initial velocity

x- component = vx

Vx = Vcos θi

Vcos θi = 5î  

y - componnent = vy

Vy = Vsin θi

Vsin θi = j

Final velocity

 x- component = vx

Vx = Vcos θf

Vcos θi = vcos (-θ)f

vx = vcos θi = √5î  

y - componnent = vy

 Vy = Vsin θf

Vsinθi = vsin (-theta)f

vy = -vsinθi = -j

so final velocity will be √5î - j