Skelly the skater is propelled by rocket power. Skelly and the rocket together have a mass of 25 kg. The thrusting force is 100 N and friction is 20 N.
a. What is Skelly’s acceleration?
b. How far does he go in 5 s if he starts from rest?
a.
Acceleration of person S.
Answer to Problem 67A
Acceleration is,
Explanation of Solution
Given:
Combined mass of person S and rocket is,
Thrust force,
Frictional force,
Formula used:
According to Newton’s law.
Where, m is mass and a is acceleration.
Calculation:
Net force acting on person S is,
Now, substituting the value of F and m and solve.
Conclusion:
Therefore, acceleration of person S is
b.
Distance travelled by person S.
Answer to Problem 67A
Distance travelled is,
Explanation of Solution
Given :
Time taken
Formula used:
According to second equation of motion.
Where, s is distance traveled, u is initial speed, a is acceleration and t is time.
Calculation:
From part (a)
As he starts from rest therefore initial velocity,
Now, substituting the value of u , a and t and solve.
Conclusion:
Therefore, distance travelled by person S is 40 m.
Chapter 6 Solutions
Conceptual Physics: The High School Physics Program
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