Question 1: Newton's Second Law
2
A 4.0 kg object accelerates at 3.0 m/s . What is the net force acting on the object?
A. 0.75 N
B. 7 N
C. 12 N
D. 24 N
Answer: C. 12 N
Explanation:
Newton's Second Law states:
F=maF=(4.0)(3.0)=12 N
Question 2: Speed
A runner travels 150 meters in 25 seconds. What is the runner's average speed?
A. 4 m/s
B. 5 m/s
C. 6 m/s
D. 7 m/s
Answer: C. 6 m/s
Explanation:
Average speed equals distance divided by time.
150
v= =6 m/s
25
Question 3: Kinetic Energy
A 2.0 kg ball moves at 5.0 m/s. What is its kinetic energy?
A. 10 J
B. 25 J
C. 50 J
D. 100 J