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Sagot :
In order to determine the acceleration of the car use the following formula:
[tex]v=v_o-at_{}[/tex]where,
vo: initial velocity = 16 m/s
v: final velocity = 0 m/s
t: time = 4.7 s
a: acceleration = ?
Solve the equation above for a and replace the values of the other parameters:
[tex]a=\frac{v_o-v}{t}=\frac{\frac{16m}{s}-\frac{0m}{s}}{4.7s}=\frac{3.40m}{s^2}[/tex]Hence, the acceleration of the car is 3.40 m/s^2, or if you consider that the car is deccelerating, it is -3.40 m/s^2.
To calculate the net required force, use the Newton second law:
[tex]F=ma[/tex]where,
m: mass of the car = 1500 kg
F: force = ?
Replace the previous values of the parameters into the expression for F:
[tex]F=(1500kg)(\frac{3.40m}{s^2})=5100N[/tex]Hence, the required force is 5100N
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