Two ice skaters stand facing each other at rest on a frozen pond. They push off against one another and the 48 kg skater acquires a speed of 0.67 m/s. If the other skater acquires a speed of 0.81 m/s, what is her mass in kilograms

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)

If anyone who can me with this hw? i would really appreciate it