Projectiles Q1. A package is released from a Q2. A ball is thrown horizontally from a helicopter flying horizontally at a constant cliff as shown. speed of 40 ms-1. The effect of air resistance is negligible. The package takes 3.0s to reach the A student makes the following statements ground. about the ball. The effects of air resistance can be The vertical speed of the ignored. ball increases as it falls. Which row in the table shows the The vertical acceleration of horizontal speed and vertical speed of the the ball increases as it falls. package just before it hits the ground? The vertical force on the ball increases as it falls. Horizontal speed Vertical speed (ms-1) (ms-1) Which of the statements is/are correct? A 0 30 A I only B 30 30 B II only C 30 40 C I and II only D 40 30 D II and III only E 40 40 E I, II and III Q3. A ball rolls down a runway and leaves it at point R. The horizontal speed of the ball at R is 1.5 ms-1. The ball takes 0.6 s to travel from R to T.
Projectiles Q1. A package is released from a helicopter flying horizontally at a constant speed of 40 ms-1. The package takes 3.0s to reach the ground. The effects of air resistance can be ignored. Which row in the table shows the horizontal speed and vertical speed of the package just before it hits the ground? Horizontal speed (ms-1) Vertical speed (ms-1) A 0 30 B 30 30 C 30 40 D 40 30 E 40 40 Q2. A ball is thrown horizontally from a cliff as shown. The effect of air resistance is negligible. A student makes the following statements about the ball. The vertical speed of the ball increases as it falls. The vertical acceleration of the ball increases as it falls. The vertical force on the ball increases as it falls. Which of the statements is/are correct? A I only B II only C I and II only D II and III only E I, II and III Q3. A ball rolls down a runway and leaves it at point R. The horizontal speed of the ball at R is 1.5 ms-1. The ball takes 0.6 s to travel from R to T.
sasbhs_science_physics_nationals_40_4047035989.docx