A jet fighter plane is launched from a catapult on an aircraft carrier. It reach

Question

A jet fighter plane is launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2 s. Assuming the acceleration is constant, what is the length of the catapult? 16 m 42 m 84 m 24 m 66 m An eagle is flying due east at 8.9 m/s carrying a gopher's in its talons. The gopher manages to break free at a height of 12 m. What is the magnitude of the gopher's velocity as it reaches the ground? 22 m/s 18 m/s 11 m/s 8.9 m/s A cannonball at ground level is aimed 30.0 degree above the horizontal and is fired with an initial speed of 125 m/s. How far away from the cannon will the cannonball hit the ground? 125 m 138 m 695 m 1380 m

Explanation / Answer

18) vf = vi + a t

42 = 0 + a(2)

a = 21 m/s^2

and d = u t + a t^2 /2

L = 0 + (21 x 2^2 / 2 ) = 42 m

Ans(B)

19) In horizontal, no acceleration hecne velocity will remain constant.

vx = 8.9 m/s

IN vertical,

vf^2 - vi^2 = 2 a d

vy^2 - 0 = 2 x -9.8 x -12

vy = 15.34 m/s

Speed = sqrt( vx^2 + vy^2) = 17.73 m/s

Ans(B)

20) R= v0^2 sin(2 theta) / g

= (125^2) sin(60) / 9.8

= 1380.8 m

Ans(D)

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