B oing to Con ret coass & Cox 125 + Con 204+001 300

Prove that : cos 24^@+ cos 55^@ + cos 125^@ + cos204^@ + cos 300^@= 1/2 .

Find the values: (v) cos 24^(@) + cos 55^(@) + cos 125^(@)+ cos 204^(@) + cos 300^(@) .

A train with 90 km/hr crosses a bridge in, 36 seconds. Another train 100 metres shorter crosses the same bridge at 45 km/hr. What is the time taken by the second train to cross the bridge? 61 s e con d s b. 62 s e con d s c. 63 s e con d s d. 64 s e con d s

A man standing on a platform finds that a train takes 3 seconds to pass him and another train of the same length moving in the opposite direction takes 4 seconds. The time taken by the trains to pass each other will be 2 3/7s e con d s b. 3 3/7s e con d s c. 4 3/7s e con d s d. 5 3/7s e con d s

A 120 metre long train is running at a speed of 90 k/hr. It will cross a railway platform 230 m long in 4 4/5s e con d s b. 7 s e con d s c. 9 1/5s e con d s d. 14 s e con d s

Prove that: cos 24^0+cos55^0+cos 125^0+cos 204^@+cos 300^0=1/2

If vec a and vec b are position vectors of A and B respectively,find the position vector of a point Con BA produced such that BC=1.5BA

. An elevator, whose floor to the ceiling dis tance is 2.50m, starts ascending with a con stant acceleration of 1.25 ms - 2. One second after the start, a bolt begins falling from the ceiling of elevator. The free fall time of the bolt is [g g=10ms^(-2) ]

Prove that cos24^(@) + cos 55^(@) + cos125^(@) +cos204^(@) + cos300^(@) = 1/2

Two trains 200 metres and 150 metres long are running on parallel rails in the same direction at speeds of 40 km/hr and 45 km/hr respectively. Time taken by the faster train to cross the slowed train will be 72 s e con d s b. 132 s e con d s c. 192 s e con d s d. 252 s e con d s