39. Find the average velocity of a projectile between the instants it crosses half the maximum height. It is projected with a speed u at an angle θ with the horizontal.
Answer: Between the instants the projectile crosses half the maximum height its displacement is horizontal, so direction of average velocity will be horizontal. In the horizontal direction the projectile has no acceleration so it moves with a uniform velocity equal to u cosθ horizontally. So magnitude of average velocity between the instants the projectile crosses half the maximum height remains u cosθ .
No comments:
Post a Comment