A1.6 kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 190 n/m. the block is pulled from its equilibrium position at x= 0.00m to a displacement x = +0.080 m and is released from rest. the block then executes simple harmonic motion along the horizontal x-axis.

a) what is the velocity of the block at time t = 0.40s?

b) what is the period of the motion?

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

An object has a weight of 500 on earth what is the mass of this object

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.