In projectile motion gravity is the only force acting on the ball. We will alway
ID: 2225481 • Letter: I
Question
In projectile motion gravity is the only force acting on the ball. We will always choose the y-axis to be exactly vertical and in this case positive in the upward direction. Since gravity acts straight down, the x component of the acceleration will be 0 m/s2 and the y component of the acceleration will be -9.80 m/s2. Consider the following case: you kick a ball. Just after it leaves your foot the x component of the velocity of the ball is 12.6 m/s and the y component of the velocity of the ball is 36.0 m/s.After a time t=1.70 s, what is the x component of velocity of the ball? After a time t=1.70 s, what is the y component of the velocity of the ball?Explanation / Answer
x - component of force F x = - 380 N time t = 3 ms = 3 * 10 -3 s x- component of impulse = F x * t ( b ) . x - component of force F y = - 380N time t = 3 ms = 3 * 10 -3 s x- component of impulse = F y * t ( c ) . x - component of impulse = change in momentuimin x- direction = mass * change in velocity = m [ v x - u x ] where u x = 20 m /s m = mass of the ball = weight of the ball / 9.8 m / s2 = 0.56 N / 9.8 m / s 2 ( d ) y - component of impulse = change inmomentuim in y- direction = mass * change in velocity = m [ v y - u y ] where u y= - 4 m / s m = mass of the ball = weight of the ball / 9.8 m / s2 = 0.56 N / 9.8 m / s 2 using this data you find answers