Question 30
Newton's Laws and MomentumA force of 16 N applied to a 4.0 kg block that is at rest on a smooth, horizontal surface. What is the velocity of the block at t = 5 seconds?
- A.4 m/s
- B.10 m/s
- C.20 m/s
- D.50 m/s
- E.80 m/s.
Show the answer and explanation
Answer: C (20 m/s)
Explanation
a = F/m = 16/4 = 4 m s−2. v = at = 4 × 5 = 20 m/s.