One way to visualize atmospheric pressure is to imagine a wedge-shaped column of air that extends from the surface to the top of the atmosphere. The weight of this column causes atmospheric pressure. There are proposals to send a robotic spacecraft to Venus that will deploy a balloon that will float in the upper atmosphere and study the planet. Explain why being higher in the atmosphere would reduce the atmospheric pressure on the spacecraft and allow it to survive for a longer period of time.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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your answer is c! hope this : )

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.