Question

I need help with these questions please. For number 2 I can’t seem to get the right answer. I got  style=”background-color:rgb(192,192,192);color:rgb(0,0,0);”>-0.6455 and this was not correct. Thank you.
1) A cannon fires a shell straight upward; 2.4 s after it is launched, the shell is moving upward with a speed of 17 m/s. Assuming air resistance is negligible, find the speed (magnitude of velocity) of the shell at launch and 5.3 s after the launch.(a) at launch=_________ m/s
(b) 5.3 s after the launch=___________ m/s



2) A driver in a moving car applies the brakes. The car slows to a final speed of 2.65 m/s over a distance of 40.0 m and a time interval of 7.70 s. The acceleration while braking is approximately constant.
(b) What is its acceleration during this time? (The car’s initial velocity is in the positive direction. Indicate the direction with the sign of your answer.)

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