Question

An object moving in the *x direction experience an acceleration of *2.0 m/s^2- This mean the object is increasing its velocity by 2.0 m/s every second. travels 2.0 m In every second. is traveling at 2.0 m/s. is decreasing its velocity by 2.0 m/s every second. Suppose that an object is moving with a constant velocity. Which statement concerning Its acceleration must be correct? The acceleration is constantly increasing. The acceleration is a constant non-zero value. The acceleration is constantly decreasing. The acceleration is equal to zero. If the velocity of an object is zero at one Instant, what is true about the acceleration of that object? (There could be more than one correct choice.) The acceleration could be positive The acceleration could be negative. The acceleration must be zero. The acceleration could be zero. Under what condition is average velocity equal to the average of the object's initial and final velocity? This can only occur if there is no acceleration. This can occur only when the velocity is zero. The acceleration must be constantly increasing. The acceleration is constant. The acceleration must be constantly decreasing. When a ball is thrown straight up with no air resistance, the acceleration at its highest point is downward is upward is zero reverses from upward to downward reverse from downward to upward A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground? T T/2 2T 4 T T/4 Two objects are dropped from a bridge, an Interval of 1.0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation decreases. decreases at first, but then stays constant. increases at first but then stays constant. stays constant. increases.

Answer 1

7) Positive Acceleration is the increase in velocity 2.0 m with respect to unit time(second)..A is correct.

8) Velocity is constant, acceleration is equal to zero......D is correct.

9)At a certain instant velocity object is zero,its is completely retarded, acceleration is negative....B is correct

10) If an object velocity changes from u to v with in a time interval, its average velocity (v+u)/2....This is possible at constant acceleration......D is correct.

11) Acceleration is always equal to acceleration due to gravity(g),at highest point, g is downwards..A is correct

12) Time taken by the freely falling object is independet of mass...A is correct.

13) For a freely falling objects, their separation is same after a time interval......D is correct.