1.the HARP(high altitude research project) gun can fire an 79 kg projectile containing scientific instrument straight up of 177 km, if we pretend there is no air resistance. what muzzle speed is required to attain this altitude?how long does the project remain at a height in excess of 1.00*10^2 km the height of interest for high-altitude research?
2.an automobile speeding at 110 km/h passes a stationary police cruiser. the police officer starts to move her cruiser in pursuit 5 s after the automobile passes. she accelerate uniformly to 131 km/h in 7s and then continue at uniform speed until she catch the speeder.
A)how far ahead relative to cruiser, is the speeder when the cruiser reaches the uniform speed of 131 km/h?
B)how long does the police cruiser take to catch the speeder?
c)how far from the initial position is the speeder caught?
The Attempt at a Solution
i need the answer and explanation