Physics Final 2019

A ball is thrown straight up. At the top of it's path its instantaneous speed is

0 m/s

suppose a car is moving in a straight line and steadily increases its speed.It moves from 30 km/h to 40 km/h the first second and from 40 km/h to 50 km/h the next second. What is the car's acceleration

10km/hxs

suppose you take a trip that covers 150km and takes 5 hours to make. Your average speed is

30km/h

A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's average acceleration?

4.2 m/s/s

the hang time for most athletes is

less than 1 second

If you drop a feather and a coin at the same time in a tube filled with air, which will reach the bottom of the tube first?

the coin

a ball is thrown upwards and caught when it comes back down. in the absence of air resistance, the speed of the ball the instant before it is caught could be

the same as the speed it had when thrown upwards

consider drops of water leaking from a water faucet. as the drops fall they

get farther apart

When you look at the speedometer in a moving car, you can see the car's

instantaneous speed

When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's acceleration

is g; no more, no less

speed is

all of the above

suppose an object is in free fall. each second the object falls

a larger distance than in the seconds before

When something falls to the ground, it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?

about 10 m/s/s

a ball is thrown straight up. At the top of its path its acceleration is

about 10 m/s/s

In the absence of air resistance, objects fall at constant

acceleration

one possible unit of speed is

all of the above

a ball is thrown into the air. At the highest point, the ball has zero velocity and zero acceleration

false

a unit of acceleration is meters per second

false

acceleration is defined as the change in

velocity divided by the time interval

as an object falls freely in a vacuum, it's

velocity increases

suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is not true?

your velocity is constant