A rocket car is traveling on a linear horizontal frictionless track when it suddenly runs out of fuel. The car has achieved a speed of 100 meters per second at the very moment the fuel is completely spent. The track then suddenly changes to a 30-degree incline from the horizontal.

Question

A rocket car is traveling on a linear horizontal frictionless track when it suddenly runs out of fuel. The car has achieved a speed of 100 meters per second at the very moment the fuel is completely spent. The track then suddenly changes to a 30-degree incline from the horizontal. 
(A) Calculate the maximum height above the horizontal track the car will rise just as it comes to a complete stop. 
(B) Calculate the distance; measured along the inclined track, the car will travel before coming to a complete stop. 
(C) Calculate the total travel time of the car on the inclined plane from the time it enters the track to the time it comes to a complete stop on the inclined track. 
(D) Calculate the rate of deceleration of the car on the inclined track.

this is a question i had posted.following the instructions, I got the answers below, plz help check, thx! 
(A)510m 
(B)1020m 
(C)10.2s 
(D)-9.80m/s^2

anyone please help...