Engineering Mechanics Dynamics836-880Problem 836:What is the acceleration of a body that increases in velocity from 20m/s to 40 m/s in 3 seconds?A.5.00 m/s2B.6.67 m/s2*C.7.00 m/s2D.8.00 m/s2Problem 837:How far does an automobile move while its speed increase uniformly from 15kph to 45kph in 20 seconds?A.185 mB.167 m*C.200 mD.172 mProblem 838: A train passing point A at a speed of 72kph accelerates at 0.5 m/s2for one minute along a straight path then decelerates at 1.0m/s2. How far in km from point A will it be 2 minutes after passing point A?A.3.60 kmB.4.65 km*C.6.49 kmD.7.30 kmProblem 839:From a speed of 75kph, a car decelerates at the rate of 500m/min2along a straight path. How far in meters will it travel in 45 seconds?A.790.293 mB.791.357 mC.793.238 mD.796.875 m*Problem 840:A train starting at initial velocity of 30kph travels a distance of 21 km in 18 minutes. Determine the acceleration of the train at this instant.A.0.0043 m/s2B.0.0206 m/s2*C.0.0865 m/s2
D.0.3820 m/s2Problem 841:An auto mobile moving at a constant velocity of a 15m/sec passes a gasoline station. Two seconds later, another automobile leaves the gasoline station and accelerates at a constant rate of 2 m/sec2. How soon the second automobile will overtakes the first?A.15.3 secB.16.8 sec*C.13.5 secD.18.6 secProblem 842: If a particle position is given by the expression x (t) =3.4t3-5.4t meters, what is the acceleration of the particle after t = 5 seconds?A.1.02 m/s2B.102 m/s2*C.3.4 m/s2D.18.1 m/s2Problem 843:The distance a body travels is a function of time and is given byx (t) = 18t + 9t2. Find its velocity at t=2.A. 36B. 54*C. 24D. 20Problem 844:Determine the velocity of progress with the given equation: D = 20t + 5t+1when t=4 seconds.A.18.6 m/sB.19.8 m/s*C.21.2 m/sD.22.4 m/sProblem 845:A ball is dropped from a building 100 m high. If the mass of the ball is 10 gm after what time will the ball strike the earth?A. 4.52s*B. 4.42sC. 5.61s
D. 2.45sProblem 846:A ball is dropped from the roof of a building 40 meters tall willhit ground with a velocity of:A.50 m/secB.28 m/sec*C.19.8 m/secD.30 m/secProblem 847:Using a powerful air gun, a steel ball is shot vertically upwardswith a velocity of 80 meter per second, followed by another shot after5 seconds. Find the initial velocity of the second ball in order to meet the first ball 150 meters from the ground.