A cart is moving toward the right and speeding up, as shown in the diagram below

Question

A cart is moving toward the right and speeding up, as shown in the diagram below. Assume that the cart is already moving at t_1. If the positive direction is toward the right, what is the sign of force at t = 2s? No direction because the magnitude is zero; Left; Right; Not enough information to estimate.; A cart is moving toward the right and slowing down, as shown in the diagram below. Assume that the cart is already moving at t_1 and t_4. If the positive direction is toward the right, what is the sign of force at t = 2s? Right; Not enough information to estimate.; Left; No direction because the magnitude is zero.;

Explanation / Answer

in question no. 7

postion is nonuniformly increases in regular time interval .

means velocity of the cart is increases , so force is act on the cart in right direction.

in question no. 8

postion is nonuniformly decreases in regular time interval .

means velocity of the cart is decreases , so force is act on the cart in left direction.

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