car 1 moves in the positive x-direction at 50mph, and car 2 moves in the positive x-direction at 70mph (both measured with respect to the ground). Imagine now that car 2 (originally moving at 70mph) starts to accelerate forward at t=0 at a rate of 1 mph per second (1 mph/s). What is car 2's velocity wrt the ground at t=1s?

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Projectile Motion