Lesson hub

Can't find the answer? Try online tutoring

How it Works

We have the UK’s best selection of online tutors, when and for how long you need them.

Getting 1-on-1 support is cheaper than you might think.

Participating users

Welcome to our free-to-use Q&A hub, where students post questions and get help from other students and tutors.

Follow the trail of responses and if you have anything to add please sign up or sign in.

You can ask your own question or look at similar Physics questions.

Using the SUVAT equations, we know a=9.8, u=0, v=7 and we are trying to find t. So we need the equation that links a, u, v and t which excludes s. 

The equation: v=u+at

Rearranging to find t: t= (v-u)/a

Substituting in the values: t=(7-0)/9.8

So t=7/9.8= 0.71s (to 2 significant figures)

Leonora speed is measured in meters per second (m/s) not m/s/s which is an acceleration. Why do you feel the need to write out Jonas' correct solution incorrectly? This is extremely unhelpful.

Thank you Jonas

Footer Graphic