An object is projected with a velocity of 100 ms -1 from the ground level

PHYSICS

WAEC 1993

An object is projected with a velocity of 100 ms^-1 from the ground level at an angle 0 to the vertical. If the total time of flight of the projectile is 10 s, calculate ?. (g = 10 ms^-2).

A. 0°
B. 30°
C. 45°
D. 60°

Correct Answer: B. 30°

Explanation

T =

2u sin?/g

sin? =

Tg/2u

10 x 10/2 x 100

= 0.5

,? = sin^-10.5 = 30^o

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