A cart is moving horizontally along a straight line with constant speed 30 𝑚/𝑠. A projectile is to be fired from the moving cart in such a way that it will return to the cart after the cart has moved 80 𝑚. At what speed (relative to the cart) must the projectile be fired (Take 𝑔 = 10 𝑚/𝑠 2 )

Question : A cart is moving horizontally along a straight line with constant speed 30 𝑚/𝑠. A projectile is to be fired from the moving cart in such a way that it will return to the cart after the cart has moved 80 𝑚. At what speed (relative to the cart) must the projectile be fired (Take 𝑔 = 10 𝑚/𝑠 2 )