need in Appendix C.) V 2. A 5.5-kg block is initially at rest on a frictionless

Question

need in Appendix C.) V 2. A 5.5-kg block is initially at rest on a frictionless horizontal surface. It is pulled with a constant horizontal force of 3.8 N (a) What is its acceleration? (b) How long must it be pulled before its speed is 5.2 m/s? (c) How far does it move in this time? 3. An electron travels in a straight line from the cathode of a vacuum tube to its anode, which is 1.5 cm away. It starts with zero speed and reaches the anode with a speed of 5.8 × 10s m/s. Assume constant acceleration and compute the force

Explanation / Answer

a) a= F/m = 3.8/5.5 = 0.691 m/s2
b) v= at
t= 5.2/0.691 = 7.53 sec
c) s= 0.5at2
= 19.6 m

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