A 0.50 kg projectile is fired with an initial speed of 10 m/s at an angle of 60o above the horizontal. What is the potential energy of the projectile at the highest point of its path

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

Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.