A stone is thrown vertically upwards It decelerates at a rate of 9 8m/s2 It reaches a greatest - Physics - Motion In A Straight Line

Question

A stone is thrown vertically upwards It decelerates at a rate of 9
8m/s2 It reaches a greatest height of 16 53m Calculate
its initial speed

Sanjay Upadhyay · Accepted Answer

Dear student
From the Newton's equation of motion
v2-u2=2as
v=0 (final speed is zero)
a= -9 8
s=16 53
u=(2×9 8×16 53) 
u=18 m/sec

Regards

A stone is thrown vertically upwards. It decelerates at a rate of 9.8m/s2. It reaches a greatest height of 16.53m. Calculate its initial speed.