Question

“Answer the following questions for projectile motion on level ground assuming negligible air resistance (the initial angle being neither nor ): (a) Is the acceleration ever zero? (b) When is the velocity a minimum? A Maximum? (c) Can the velocity ever be the same as the initial velocity at a time other than at t=0? (d) Can the speed ever be the same as the initial speed at a time other than at t=0?

Answer 1

a) no , x componenent of acceleration only zero so acceleration due to gravity is acting on the projectile during the motion along the negative y direction

b) maximum speed is just before it hits the ground and The minimum speed will be when the projectile reaches its maximum height

c) no during the motion at every instant direction of the velocity changes so that velocity of the projectile never be same as that of the intial value

d) Yes, when it reaches the same height above ground while descending