A 4900-lbs car on a level road is tripling its speed. Let Kl and Kf be...

Question

Question

science physics

Answer 1

Answer #1

5) Velocity tripled so $K_{f} = 9K_{i}$

Total work done = $K_{f} - K_{i}= 8K_{i}$ , Option B

6) We dont apply any force in the direction of displacement, only perpendicular to it. So no work done. Option B.

7) Now work is done against gravity = m*g*h = $14*1.7*9.8 = 233.24J$ . Option A is close

Answer 2

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