A bullet is fired from the gun with a speed of 1000 m/s m order to hit a target. s = 100 m away. At what height above the target should by gun be aimed? (The resistance of air is negligible and g=10 m/s2 )

Question

A bullet is fired from the gun with a speed of 1000 m/s m order to hit a target. s = 100 m away. At what height above the target should by gun be aimed? (The resistance of air is negligible and g=10 m/s2 ) (A) 23 cm (B) 15 cm (C) 9 cm (D) 5 cm

Tardigrade Admin · Accepted Answer

Here: Speed of bullet v = 1000 m/s Distance of target s = 100 m The time taken to cover the horizontal distance of 100 m from the gun to the target is given by t=(100/1000)=0.1 second During this time, the bullet will fall down vertically under gravity Hence, height h=u t+(1/2) g t2 =0 × (1/2) × 10 ×(0.1)2 =5 × 0.01=0.05 m =5 cm

Q. A bullet is fired from the gun with a speed of 1000m/s m order to hit a target. s=100m away. At what height above the target should by gun be aimed? (The resistance of air is negligible and g=10m/s2 )

23 cm

15 cm

9 cm

5 cm

Q. A bullet is fired from the gun with a speed of $1000 m / s$ m order to hit a target. $s = 100 m$ away. At what height above the target should by gun be aimed? (The resistance of air is negligible and $g = 10 m / s^{2}$ )