Exam 2: Motion in One Dimension

At the top of a cliff 80 m high,Raoul throws a rock upward with velocity 11.0 m/s.How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff? ​

When a drag strip vehicle reaches a velocity of 63 m/s,it begins a negative acceleration by releasing a drag chute and applying its brakes.While reducing its velocity back to zero,its acceleration along a straight line path is a constant −7.2 m/s².What displacement does it undergo during this deceleration period?

Maria throws two stones from the top edge of a building with a speed of 18 m/s.She throws one straight down and the other straight up.The first one hits the street in a time t₁.How much later is it before the second stone hits?

Two students are working on the same constant acceleration problem involving a car undergoing constant acceleration,having started from rest and after a certain time having traveled a distance of 108 m.The students are to find the average velocity.Both students are required to show their work and round any intermediate answers as well as the final answer properly to 3 significant figures.Each rounded answer is to be used in the next step of calculation as they proceed.For the final answer,Student A uses the formula Getting the result 7.26 m/s,and Student B uses the formula Getting the result 7.29 m/s.Assuming neither student makes a mistake,which student has the better answer?

A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 49.0 m/s in 5.00 seconds.She then pulls the parachute cord and after a 5.00-second constant deceleration,descends at 11.0 m/s for 60.0 seconds,reaching the ground.From what height did the parachutist jump? ​

Norma releases a bowling ball from rest;it rolls down a ramp with constant acceleration.After half a second it has traveled 0.55 m.How far has it traveled after two seconds? ​

A ball rolls down an incline,starting from rest.If the total time it takes to reach the end of the incline is T,how much time has elapsed when it is halfway down the incline?

A change in a physical quantity w having initial value w_i and final value w_f is given by which of the following?

A bird,accelerating from rest at a constant rate,experiences a displacement of 26 m in 12 s.What is the average velocity?

A cheetah can run at approximately 100 km/hr and a gazelle at 80.0 km/hr.If both animals are running at full speed,with the gazelle 55.0 m ahead,how long before the cheetah catches its prey? ​

A rock,released at rest from the top of a tower,hits the ground after 1.5 s.What is the speed of the rock as it hits the ground? (g = 9.8 m/s² and air resistance is negligible)

In one-dimensional motion where the direction is indicated by a plus or minus sign,the average velocity of an object has which of the following properties?

A baseball is released at rest from the top of the Washington Monument.It hits the ground after falling for 5.85 s.What was the height from which the ball was dropped? (g = 9.8 m/s² and assume air resistance is negligible) ​

Gwen releases a rock at rest from the top of a 39-m tower.If g = 9.8 m/s² and air resistance is negligible,what is the speed of the rock as it hits the ground? ​

A v vs.t graph is drawn for a ball moving in one direction.The graph starts at the origin and at t = 5 s the acceleration of the ball is zero.We know that at t = 5 s,

An automobile driver puts on the brakes and decelerates from 35.0 m/s to zero in 11.0 s.What distance does the car travel?

A bird,accelerating from rest at a constant rate,experiences a displacement of 25 m in 11 s.What is the final velocity after 11 s? ​

In which of the following cases is the displacement's magnitude half the distance traveled? ​

A ball is thrown vertically upwards at 18.5 m/s.For its complete trip (up and back down to the starting position),its average velocity is:

A basketball player can jump 1.6 m off the hardwood floor.With what upward velocity did he leave the floor? ​