A skateboarder coasts down a long hill, starting from rest and moving with const

Question

A skateboarder coasts down a long hill, starting from rest and moving with constant acceleration to cover a certain distance in 6 s. In a second trial, he starts from rest and moves with the same acceleration for 12 s. How is his displacement different In this second trial compared to the first trail? A juggler throws two balls at different times both starting with the same initial vertical position and initial velocity. At some point in time, they both are at the same height where one is at the halfway point going up when the other is at the halfway point coming down. At that point: Their velocities and accelerations arc equal. Their velocities and accelerations are both equal in magnitude but opposite in direction. Their velocities are equal and their accelerations are equal in magnitude but opposite in direction. Their accelerations are equal and their velocities are equal In magnitude but opposite in direction.

Explanation / Answer

9)

a is incorrect because B has greatest speed at all times

b is incorrect because C has increasing speed.

only c is correct.

10)

D = ut + 1/2*at^2

D = 1/2*at^2

D is depend on t^2

so (b) is correct.

11)

(b) is correct. because directions are different.

12)

(c) should be correct.

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