At the maximum height of the projectile motion a. the y-component of its acceleration is constant O b. the x-component of its acceleration is zero O c. the y component of its velocity is zero d. All answers are correct Question 5 An object projected upward from the level ground with an initial speed 20m/sec at an angle 30 with the Not yet horizontal. It takes- --to hit the ground (g- 10 m/s?) answered Marked out of O a. 4 sec 1.50 O b. 2 sec P Flag question O c. 5 sec O d. 3 sec