Step-by-step explanation:
17) the amount of work needed in Joules will be equal to the change in Kinetic Energy (1/2 m v^2) of the car
1/2 (100 kg) ( 5 ^2 - 11^2 ) = -4800 J
18) K E = 1/2 m v^2 = 1/2 * 70 * 6^2 = 1260 J
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