Question

two seconds after projection a projectile is travelling in a direction incline at
30 degree to the horizontal after one more second it is travelling horizontally the magnitude and direction of its velocity are
​

Answer 1

Answer:

Let in 2 sec body reaches upto point Aand after one more secupto point B. Total time of ascent for a body is given 3 seci.e.3singut30310sinu…..(i)Horizontal component of velocity remains always constant 30coscosvu…..(ii)For vertical upward motion between point O andA2sin30singuvotguvUsing 203030sinov30sinAsu./20smvSubstituting this value in equation (ii) ou30cos20cos310…..(iii) From equation (i) and (iii) 320uand 60

Answer 2

Answer:

The graph (very poorly drawn) shows y as a function of x at given moments of time.

I used the following facts

1) v = u + at (first kinematics eq)

2)

where Vy is v sub y, vertical component of velocity at that instant and similarly Vx

3) horizontal component of velocity, u cos( theta ) remains constant.

for rest look the image, answer 60°