An aircraft shell is fired vertically upward with a muzzle velocity of 100ms-¹. Calculate the –maximum height it can attain
–time taken to reach the maximum height
–instantaneous velocities at the end of 20s and 50s respectively​

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?