Question

 If body is projected at an angle 30⁰ with horizontal with velocity 440 cm/s the time flight is -----

a) 0.4 sec     b) 0.550 sec    
  c) 0.448 sec      d) 0.5 sec​

Answer 1

Time of tht of the body is 0.448 sec Option.

Answer 2

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c) 0.448 sec

Step-by-step explanation:

We have :

→ Velocity of projection = 440 cm/s

→ Angle of projection = 30°

→ Acceleration due to gravity = 9.8 m/s²

sin 30° = 0.5

Firstly let's convert the unit of velocity of projection from cm/s to m/s.

1 cm/s = 0.01 m/s

440 cm/s = 440(0.01)

4.4 m/s

From formula for 'Time of Flight' of a projectile':

T = 2usine/g

Where :

• T is the time period.

• u is the velocity of projection.

• e is the angle of projection.

• g is acceleration due to gravity.

Substituting values, we get :

T= (2x 4.4 x 0.5)/9.8

T = 4.4/9.8

T = 0.448 sec

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