1. A projectile is fired at an angle of 60.0° above the horizontal with an initi

Question

1. A projectile is fired at an angle of 60.0° above the horizontal with an initial speed of 30.0 m/s. What is the magnitude of the horizontal component of the projectile's displacement at the end of 2 s?

2.A tennis ball is thrown upward at an angle from point A. It follows a parabolic trajectory and hits the ground at point D. At the instant shown, the ball is at point B. Point C represents the highest position of the ball above the ground. Which statement is true concerning the ball when it is at C, the highest point in its trajectory?
(a) The ball’s velocity and acceleration
are both zero.
(b) The ball’s velocity is perpendicular to
its acceleration.
(c) The ball’s velocity is not zero, but its acceleration is zero.
(d) The ball’s velocity is zero, but its acceleration is not zero.
(e) The horizontal and vertical components of the ball’s velocity are equal.

Explanation / Answer

(1) Initial velocity u = 30 m/s Angle of projection ? = 60 degrees time t = 2 s Horizontal distance X = u cos? * t = 30 m (2) The ball’s velocity is perpendicular to its acceleration. Option : (b) is correct

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