A ball of ice having mass 100 g at time t = 0 s is melting, and therefore losing mass, at a steady rate of 1 g/s. The ball has velocity i + 2 j at time t = 0 and is subject to a constant force F = 3 i thereafter. What is its velocity after 1 minute?
A) 10 i + 5 j
B) 10 i + 10 j
C) 4 i + 5 j
D) 4 i + 8 j
E) 10 i + 8 j

Question

Quizplus · Accepted Answer

The force only affects the i-component of velocity, adding 1 m/s each second due to F=ma and mass reducing by 1g/s. The j-component remains unchanged. After 60s, velocity is 10 i + 2 j.

A Ball of Ice Having Mass 100 G at Time