Physics motion problems i th questiofns to maximize your points on the exam. Goo
ID: 1403358 • Letter: P
Question
Physics motion problems i th questiofns to maximize your points on the exam. Good luck. A train travelling with a velocity of 100 mph decelerates to a stop within a displacement of 200 m. Determine the deceleration of the train. (Use 1 mile - 1.609 km). (a) 4.996%) An airplane accelerates from rest to its required takeoff speed with an acceleration 5.0 m/s after travelling on the runway a dist (b) after travelling on the runway a distance of 1.5 km. Find the takeoff speed of the (a) A tennis ball is thrown with a velocity of 20 m/s at an angle of 30° with horizontal from a height of 40 m from the ground. Find the horizontal distance travelled by the ball (i.e. the range). ,--loris-.oas -150 r-goas30 x 4 5SS.utn/ " 14 (b) A rescue boat is to rescue the passengers on a distressed ship located directly opposite toExplanation / Answer
a)
initial speed of the car, u = 100 mph
= 100*1.609 km/h
= 100*1.609*5/18
= 44.7 m/s
final speed, v = 0
Let a is the acceleration of the truck.
Apply, v^2 - u^2 = 2*a*s
a = (v^2-u^2)/(2*s)
= (0^2 - 44.7^2^2)/(2*200)
= -5 m/s^2
b) take off speed, v = sqrt(2*g*d)
= sqrt(2*9.8*1500)
= 171.46 m/s