Question # A projectile is launched from the ground level with a speed u at an angle ( theta ) with the horizo What is its average velocity between the two instants that it crosses half the maximum heigh

# A projectile is launched from the ground level with a speed u at an angle ( theta ) with the horizo What is its average velocity between the two instants that it crosses half the maximum heigh

(A) ( u sin theta )

(B) ( u cos theta )

(C) ( u tan theta )

( (mathrm{D}) mathrm{u} )

Solution

(u_{x} = ucos theta, uy = usin theta) (avg velocity=displacement/time)

displament is anly in ( x ) diresfion. aug velocity ( =frac{(u cos theta) t}{t}=u cos theta )

Ophion ( (B) )