6. A child slides down a hill on a toboggan with an acceleration of 1.80 m/s2. If she starts with an initial push of 1.2 m/s, how far does she travel in 4.00 s?​

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

In the first law of thermodynamics, triangle e=q-w, what does q stand for

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s