Question

Do only 5;9;10 and 13 questions other solutions i got but try to do 2also

Answer 1

5)25=[20^2+10^2+2×20×10cosx]^(1/2)

cosx=5/16, x=71.79°

9)u=90 km/h=25 m/s

a=0.5 m/s^2

s=u^2/2a=625 m

13)%error in radius =2%

% error in volume of sphere=2×3=6%