A projectile is fired at an angle of 30º to the horizontal such that the vertical component of its initial velocity is 80 m/s. Its time of flight is T. Its velocity at t = T/4 has a magnitude of nearly:
Text Solution
Verified by ExpertsThe correct answer is:
C
= cot 30 0 = 
∴ u x =80 
m/s
T = 
∴ T = 16 s
At t = 
= 4s, v x = 80 
m/s
v y = 80 – 10 × 4 = 40 m/s
∴ v = 
= 140 m/s
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