Physics Please

If a freely falling object were somehow equipped with a speedometer, its speeding reading would increase each second by about

10 m/s

Neglecting air resistance, a bullet fired straight down from the top of a high cliff has an acceleration of

10 m/s^2

A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to the Earth, the boat travels

141 m

A river 100 m wide flows due south at 1 m/s. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank

100 m farther south

An object falls freely from rest on a planet where the acceleration due to gravity is 20 meters per second squared. After 5 seconds, the object will have a speed of

100 m/s

A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is

100-90=10m/s2 and 10/10= 1m/s2

A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of

about 14 km/h

Which of the following is not a vector quantity?

all are vector quantities

Compared with the hang time on the Earth, the hang time on the moon would be

greater

The distance a freely falling bowling ball falls each second

increases

A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water

the same for each bullet

A mosquito flying at 3m/s that encounters a breeze blowing at 3m/s the opposite way, what is its speed

0 m/s

An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration is

0 m/s^2

The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is about

1 s

A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each second it rolls. What is its acceleration down the incline?

2 m/s^2

The total time it takes a projectile fired straight up at 10 m/s to reach the top of its path and return to its starting point is about

2 s

At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately

40 m/s

A humming bird flying at 4 km/h that gets caught in a 3-km/h crosswind has a resultant speed of about

5 km/h

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, one second later the rock's speed is

5 m/s

A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has a speed of

6 m/s

At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is

60 m/s

Jogging jake runs at 4m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is

6m/s (subtract)

A ball starting from rest at the top of an inclined plane accelerates at 2 m/s^2 and reaches the bottom of the plane in 3 seconds. What is the length of the plane?

9 m

If an object moves with constant acceleration, its velocity must

change by the same amount each second

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always

directed downward