1. A car with a mass of 750Kg moves on flat ground. The friction force of the car is in the opposite direction of the speed and is 200N. A. Calculate the engine power from which the car travels from stationary to accelerated

4m / s in 5s.

B. Calculate the acceleration of the car.

C. Calculate the change in the amount of motion and the collection of kinetic energy.

Please show me explanation​

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s