How fast is the ball right before it strikes the ground?

40 30 Figure 1. The red points from 1 to 15 show the successive locations of a puck at times t=0s, 1/6 s, 2/6 s, 3/6 s, 4/6 s, etc. Connecting these points with the blue curve shows the puck's trajectory. The blue coordinate system is tilted and displaced with respect to the black coordinate system. 20 15 In Figure 1, at red point 1 is the x-component of the velocity of the puck positive or negative? 10 25 10 35 40 45 50. 55 Use the blue coordinate system. O Negative O Positive

What do you need in order to determine the initial velocity of a projectile fired horizontally?

what’s the initial and final height of the ball?

A ball is thrown straight up with enough speed so that it is in the air for several seconds. (a) What is the velocity of the ball when it reaches its highest point?

When baseball players throw the ball from the out eld, they usually allow it to take one bounce before it reaches the in eld because they think that the ball will arrive sooner that way. Suppose that the angle at which a bounced ball leaves the ground is the same as the angle at which it is thrown but the ball's speed after the bounce is one-half of what it was just before the bounce. (a) Assume that the ball is always thrown with the same initial speed. At what angle  should the elder throw the ball to make it go the same distance D with one bounce as a ball thrown upwards at 45  with no bounce? (b) Determine the ratio of the time intervals for the two paths. Is it better to throw the ball on a bounce?

If you double the initial speed of a projectile, what happens to that projectiles range? Assume that the projectile lands at the same height from which it was launched

why is the projectile motion in 2 directions can be studied as a combination of 2 one directions?

Which expression correctly gives the total time the projectile spends in the air? t = _______ a) vi/g b) 2vi/g c) vi sin(θ)/g d) 2 vi sin(θ)/g

A person rows a boat 4 m/s directly west across a stream that flows south at 3 m/s. What is the resultant velocity of the boat as it crosses the river?