A woman walks a distance of $240 \mathrm{~m}$ with an average speed of $1.2 \mathrm{~m} / \mathrm{s}$. What time was required to walk this distance?

A walker completes a  $2.4 \mathrm{~km}$ route in 30 minutes. What is the walker's average speed in  $\mathrm{km} / \mathrm{h}$ for this distance?

A ball is thrown downward with an initial velocity of $12 \mathrm{~m} / \mathrm{s}$. Using the approximate value of $g=10 \mathrm{~m} / \mathrm{s}^2$, what is the velocity of the ball $1.0$ seconds after it is released?

A car accelerates uniformly for 5 seconds, then travels at constant velocity for 5 seconds before decelerating uniformly for 5 seconds. Create velocity versus time and acceleration versus time graphs for this situation.

A car starts from rest, accelerates uniformly for 5 seconds, travels at constant velocity for 5 seconds, and finally decelerates uniformly for 5 seconds. Sketch graphs of velocity versus time and acceleration versus time for this situation.

A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff, the rock has a speed of 29 m/s. Assuming that air resistance can be ignored, find (a) the initial speed of the rock and (b) the greatest height of the rock as measured from the base of the cliff.

Acidosis

a. increases neuron excitability.

b. can produce tetany by affecting the peripheral nervous system.

c. may lead to coma.

d. may produce convulsions through the central nervous system.

A car starts from rest and travels for 5.0 s with a uniform acceleration of +1.5 m/s$^2$. The driver then applies the brakes, causing a uniform acceleration of -2.0 m/s$^2$. If the brakes are applied for 3.0 s, how far has the car gone?

A car starts from rest and travels for 5.0 s with a uniform acceleration of $+ 1.5 \mathrm { m } / \mathrm { s } ^ { 2 }$. The driver then applies the brakes, causing a uniform acceleration of -2.0 m/s$^2$. If the brakes are applied for 3.0 s, how fast is the car going at the end of the braking period.

A car starts from rest and travels for 5.0 s with a uniform acceleration of +1.7 m/s$^2$. The driver then applies the brakes, causing a uniform acceleration of -1.0 m/s$^2$. If the brakes are applied for 1.0 s, determine each of the following.

How fast is the car going at the end of the braking period?

How far has it gone?

A diving platform drops a steel ball (with an initial velocity of zero). Using  $g=10 \mathrm{~m} / \mathrm{s}^2$ and an approximation of its value: a. What is the ball's velocity 0.07 seconds after it is reset? b. After it is released, what velocity  $1.4$ is it travelling at?

A car driver applies the brakes, causing the vehicle's velocity to decrease. Does the car accelerate during this process, according to the definition of acceleration provided in this chapter? Explain.

Does a car's speedometer show instantaneous speed, average speed, or velocity? Explain.

When stopped by police, a driver claims she was doing 80 mph. Is that an unequivocal statement? Would this be interpreted differently in the UK than in the US? Explain.