Physics suvat

Hi please could i have help on this question? I thought the answer would be a because the initial velocity is vt sin theta and the formula to substitute in is s=ut+1/2at^2 but the answer is b?

Here is the question: https://app.gemoo.com/share/image-annotation/587364514747166720?codeId=DW2qRk0z21m06&origin=imageurlgenerator

Thanks!

Reply 1

lordaxil

You should consider the sign (direction) of acceleration due to gravity relative to that of initial vertical velocity. Another way of thinking about it is: if both the velocity and acceleration terms are positive, how would the ball fall to the ground again?