Question

hi I am writing tomorrow anthe exam so I need help in lines and angles and gravitational force plz help me how to learn easily. ok plz explain with steps

Answer 1

See in 4th question we are given

Height = 80 m
Gravitational acceleration = 10m/s2
Dropped condition = initial velocity = 0

so using kinematics equation

s = ut + 1/2gt^2

80 = 1/2 × 10 × t^2

t^2 = 16

t = 4 sec
so object will remain in air till 4 seconds.

Hope it helps!