Questions elaeto the graph below, which shows the net force F in newtons exerted

Question

Questions elaeto the graph below, which shows the net force F in newtons exerted on a 1-kilogram block as a function of time t in seconds. Assume that the block is at rest at t=0 and that F acts in a fixed direction. Force F 4 (N) 3 0 1 2 3 4 5 6 7 8910 Time t (s) The acceleration of the blockat4seconds is (A) m/s (B) 1 m/s (C) 3 m/s2 (D). 9 m/s (E) 12 m/s During which of the following time intervals is the speed of the block constant? (A) 0 to 3 s (B) 3 to 6 s (C) 6 to 8s (D) 8 to 10 s None of the time intervals

Explanation / Answer

At t=4s, Force F=3N

mass of the block m=1kg

Let a be the acceleration of the block at t=4s

Then, F=ma

a = F/m = 3/1 = 3 m/s2

10. The speed of the block is never constant. It is accelerating throughout the whole time interval.

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