The following graphs show the straight line position x against the time t for an

Question

The following graphs show the straight line position x against the time t for an object moving along a straight line: In which case does the object... (a) move with constant speed? [A B C D] (b) always increase its speed? [A B C D] (c) always slow down? [A B C D] (d) change direction? [A B C D] (e) come to a brief stop at some point in time? [A B C D] If you drop an object it accelerates downward (9.8 m/s^2 in the resistance) due to Earth's gravity. If you instead throw it upward, so that it velocity v_0, how will its acceleration be directed? [A] upward (9.8 m/s^2) [B] downward (9.8 m/s^2) [C] first upward (9.8 m/s^2) and then downward (9.8 m/s^2) after the turning

Explanation / Answer

(a) Ans (B), since straight line indicates constant speed

(b) Ans (D), since slope keeps on increasing with time

(c) Ans (A), since slopekeeps on decreasing with time

(d) Ans (C), sine slope changes its sign from positive to negative

(e) Ans (C), since slope becomes zero at an instant

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