A heavy projectile is thrown and follows a path something like the one shown in

Question

A heavy projectile is thrown and follows a path something like the one shown in the figure at the right. For each of the quantities in the list (a) - (d) below, select a direction from one of the choices in the list A - G. If you think that none of the choices apply, put an N.^1 Points straight up Points straight down Points directly to the left Points directly to the right Is equal to zero Points somewhat upward and to the right points somewhat upward and to the left None of the above The projectile's velocity when it is at the highest point. The projectile's acceleration when it is part way up. The projectile's acceleration at the highest point. The projectile's acceleration when it is part way down. The graphs below show the velocity versus time for two identical train engines on a straight track. A positive velocity indicates that the engine was traveling east. The scales both axes are the same for the graphs. On each graph a point is marked with a dot. A student who is asked how the net force acting on the engine in graph A at the identified point compares to the net force acting on the engine in graph B States: "I think that B has the larger net force since the net force on A at the identified point is zero." What, if anything, is wrong with this statement? If something is wrong, identify it, and explain how to correct it. If the statement is correct, explain why.

Explanation / Answer

Solving 1st question

1.The projectile velocity at highest point->point directly to right (D)

2.The projectile acceleration when it is part way up ->point straight down (B)

3.The projectile acceleration at highest point ->point straight down(B)

4.The projectile acceleration when it is down->point straight down(B)

2nd question

force =mass*acceleration

and acceleration=slope of velocity-time graph

and since slope of both graph is almost same so force is also same

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