The x-coordinate of a particle moving along x-axis varies with time as x = 6 - 4t + t^2, where x is in meter and t is in second. Then distance covered by the particle in first 3 seconds is :

• 1 m
• 3 m
• 5 m
• 7 m

I got the answer as 3 m but the correct answer is given as 5 m . I am confused , so please tell the correct answer with explanation !

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

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