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(1) There are _____ main types of motion. (2) An accelerated body is one whose velocity is _____ . (3) The unit 〖cm s〗^(-1)is the unit of _____ . (4) If a body starts from rest , its initial velocity is

△PQR is a right triangle at Q. If ∠R = 60° and QR = 4 cm, then PR = ………. A. 4 cm B. 5 cm C. 6 cm D. 7 cm E. 8 cm 21.In the figure, TG is a tower and angle of elevation of T from the point is 45°. If PG

DE:BC= ……… A. 1:2 B. 1:3 C. 2:3 C. 3:4 E. 3:2 20.x2=……….. A. 43 B. 45 C. 85 D. 93 E. 80 x=……… A. 20 B.30 C.35 d. 40 E. 50 A and B are two sets such that n(A) = 10, n(B)= 25 and n(A∪B) =30, where n(P) is