1-what is the diffrence between average speed and average velocity?

2-plz answer the problem..............

a motor car is going due north at a speed of 50 km/hr.it makes a 90 degrr left turn without changing its speed.the change in the velocity of the car is about---------------------

options:50 km/hr towards west

70 km/hr towads south west

0

plz explain me

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.

11

21

31

41