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1D_a_constant

# 1D_a_constant - 1-D Particle Kinematics 1-D motion with...

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1-D Particle Kinematics – 1-D motion with constant acceleration Initial kinematic quantities at the starting time: Initial position x 0 and initial velocity υ 0 . – Constant acceleration motion 0 2 0 0 2 2 0 0 1 2 2 ( ) at x x t at a x x υ υ υ υ υ = + = + + = + – Constant velocity motion 0 0 x x t υ υ υ = = + Example 1. A particle is moving along a straight line with constant acceleration. Measured from a chosen reference frame, the particle‘s starting position is +2 m at t = 0. The particle is observed to move to the origin with a velocity of 0.8 m/s when t = 10 s. Find the time instant when the particle change its direction of motion. ( Ans :6 s) 2. Free fall : A ball is thrown upward at the corner of a building as shown. It takes 5 s for the ball to hit the ground. Find the maximum height of the ball h above the starting point.

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