Starting from rest, a particle confined to move along a straight line is acceler

Question

Starting from rest, a particle confined to move along a straight line is accelerated at a rate of 4 m/s^2. Which statement accurately the motion of the particle? The particle travels describes 4 meters during each second. The particle travels 4 meters during the first second only. The speed of the particle increases by 4 m/s during each second. The acceleration of the particle increases by 4 m/s^2 during each second. The final velocity of the particle will be proportional to the distance that the particle covers. A spring-loaded gun is aimed horizontally and is used to launch identical balls with different initial speeds. The gun is at a fixed position above the floor. The balls are fired one at a time. If the speed of the second ball fired is twice the speed of the first ball fired, how is the horizontal range (denoted R in the figure) affected? The range for both balls will be the same. The range of the second ball will be half as much as that of the first ball. The range of the second ball will be twice as large as that of the first ball. The range of the second ball is about 1.4 times larger than that of the first ball. The range of the second ball will be smaller than that of the first ball by a factor of 1.4. A man stands on a spring scale in a moving elevator and notices that the scale reading is 20% larger than when he weighs himself in his bathroom. Which statement must be false? The tension in the supporting cable must exceed the of elevator and its contents. The speed of the elevator changes by equal amounts in equal times. The elevator could be moving upward with increasing speed. The elevator could be moving downward with decreasing speed. The elevator could be moving upward at constant speed.

Explanation / Answer

Q: 5 ( correct option is C) : Speed increases

Q:6 option C ( range of second ball will be twice the first ball)

Q: 7 option D

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