Im trying to practice digital mobile communication exercises but when I get to these two question Im stuck I don't know how to solve them your help would be much appreciated ASAP please.
First Question :
1) If the pulse shaping filter has the following impulse response, draw the impulse response for the matched filter. Also explain why this is not a good pulse.
(Note: since I can't paste picture of pulse filter in this textarea, it's same as "step and impulse" respond in this link http://www.nuhertz.com/index.php/response/advanced-filters/matched-filters
which has drawn in yellow).

Second question is:
2) A system occupies a bandwidth of 5MHz and the time slot duration for each user is 1ms. It operates at 800MHz has the following power delay profile:

Tap number |Excess Delay (Micro second) | Normalised Average Power (dB)
1 | 0 | 0
2 | 0.5 | -2
3 | 1.8 | -5
4 | 4 | -8
5 | 10 | -15

A mobile user is travelling at 180km/h.

a) What is the Root Mean Sqaure (rms) delay spread of this channel?
b) What is the 90% coherence bandwidth?
c) What is the 50% coherence time?
d) What type of fading channel will the user experience?

sorry if my format is little bit annoying I tried by best and Thanks in Advance your help would be much appreciated ASAP please.