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 )
(A) 10 𝑚/𝑠
(B) 10√8 𝑚/𝑠
(C) 40/ 3 𝑚/𝑠
(D) None of the above
Answer : option (C)
Solution :
