Science

PhysicsQ&A Libraryit take to reach highest point? (d) What is its velocity when it returns to the level from which it started? P 2.47 A certain freely falling object, released from rest, requires 1.50 s to travel the last 30.0 m before it hits the ground. (a) Find the velocity of the object when it is 30.0 m above the ground. (b) Find the total distance the object travels during the fall P 2.51 A tennis player tosses a tennis ball straight up and then catches it after 2.00 s at the same height as the point of release. (a) What is the acceleration of the ball while it is in flight? (b) What is the velocity of the ball when it reaches its maximum height? Find (c) the initial veloc-ity of the ball and (d) the maximum height it reaches. P 2.59 A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.00 m above. The brother's outstretched hand catches the keys 1.50 s later. (a) With what initial velocity were the keys thrown? (b)? What was the velocity of the keys just before they were caught? P 2.68 The driver ofa truck slams on the brakes when he sees a tree blocking the road. The truck slows dc uniformly with an acceleration of -5.60 m/s for 4.20 s, making skid marks 62.4 m long that end at tree. With what speed does the truck then strike the tree? P 2.75 1nder the treQuestion

On question p 2.51, I am confused on part c and d

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