A cart is moving horizontally along a straight line with constant speed of 20 m/s.A projectile is to be fired from the moving cart so that it returns to the same cart after the cart has moved 60 m.The speed with which the projectile must be fired with respect to the cart is
1) 5 m/s
2) 10 m/s
3) 15 m/s
4) 20 m/s
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