If a projectile has maximum range of 36m find t... - JAMB Physics 2015 Question
If a projectile has maximum range of 36m, find the speed of projection (Take g = 9.8m/s2)
A
27m/s2
B
2m/s2
C
4m/s2
D
7m/s2
correct option: a
For maximum range (Rmax)
Rmax = U2 ÷ α g where Rmax = 36m, U2 = ?, g = 9.8m/s2
36 = U2 ÷ 2 × 8.8
U2 = 36 × 2 × 9.8m = 705.8
√U = √ 705.6 = 26.5 (squaring both side)
u= 26.5m/s, U = 27m/s (Approx.)
The speed of projection = 27m/s2
Rmax = U2 ÷ α g where Rmax = 36m, U2 = ?, g = 9.8m/s2
36 = U2 ÷ 2 × 8.8
U2 = 36 × 2 × 9.8m = 705.8
√U = √ 705.6 = 26.5 (squaring both side)
u= 26.5m/s, U = 27m/s (Approx.)
The speed of projection = 27m/s2
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