bốn thửa ruộng nhà bác an, ba , đạt, lan thu hoạch được 1,2 tấn gạo. SỐ thóc thu hoạch được của bác an , ba, đạt lần lượt là 1/3; 0,3; 15%.tính khối lượng thóc nhà bác lan thu hoạch được là

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.