At the gym a woman a Lifts 40 kg of weight on the leg press. It takes her a 0.5 seconds to raise the weights a vertical distance of 0.4 m. How much power does the woman generate when lifting the weights? 180 W
205 W
314 W
502 W

Aplanet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass m 2.75 x 1029 kg. the radius of the orbit is r 8.05 x107 km. what is the orbital period (in earth days) of the planet tplanet?

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

Could someone . i have tried to solve myself but my calculation is off