Need Explanations, Prefer pictures of notes for problem solving Q16 A 400 kg car

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Need Explanations,

Prefer pictures of notes for problem solving

Q16 A 400 kg car moving at 10 m/s comes to a stop in 10 seconds under the action of a
constant force. What is the value of the force?
A. There is no force acting on the car since it is slowing down, not speeding up
B. 4000 N
C. 400 N
D. 2000 N
E. 10 N

Q17 Two sumo wrestlers of mass 180 kg and 150 kg charge at each other with a speed of 3
m/s to the right and 4 m/s to the left respectively. Which of the wrestlers feel a greater
force on impact?
A. Wrestler with mass 180 kg, and speed 3 m/s
B. Wrestler with mass 150 kg, and speed 4 m/s
C. Equal forces
D. Depends on whether they collide elastically or inelastically

Q18 Let

Explanation / Answer

16]

acceleration =V/T=10/10=1 m/s/s

thus Force =Ma=400*1 =400 N

17]

using newton 3rd law

C. Equal forces

18]

as motion is inelastic thus energy is not conserved

B. Use momentum conservation

19]

C. The kinetic energy transferred to the passenger

20]

S=0.5*a*t^2

=0.5*10*3*3

45m

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